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52 vulnerabilities found for by traefik
CVE-2026-71327 (GCVE-0-2026-71327)
Vulnerability from cvelistv5
Published
2026-08-06 16:38
Modified
2026-08-07 15:41
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-694 - Use of Multiple Resources with Duplicate Identifier
Summary
Traefik is an open source HTTP reverse proxy and load balancer. From 3.0.0 until 3.6.25 and 3.7.10, Traefik's Kubernetes Gateway API provider in pkg/provider/kubernetes/gateway/httproute.go, grpcroute.go, tcproute.go, and tlsroute.go builds HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute router and service identities by hyphen-concatenating namespace, route name, Gateway identity, entry point, and rule index, allowing colliding Routes to overwrite another namespace's backend. This issue is fixed in 3.6.25 and 3.7.10.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||
Impacted products
{
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"timestamp": "2026-08-07T15:40:56.189049Z",
"version": "2.0.3"
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"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
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{
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"vendor": "traefik",
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{
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},
{
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}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Traefik is an open source HTTP reverse proxy and load balancer. From 3.0.0 until 3.6.25 and 3.7.10, Traefik\u0027s Kubernetes Gateway API provider in pkg/provider/kubernetes/gateway/httproute.go, grpcroute.go, tcproute.go, and tlsroute.go builds HTTPRoute, GRPCRoute, TCPRoute, and TLSRoute router and service identities by hyphen-concatenating namespace, route name, Gateway identity, entry point, and rule index, allowing colliding Routes to overwrite another namespace\u0027s backend. This issue is fixed in 3.6.25 and 3.7.10."
}
],
"metrics": [
{
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"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7.6,
"baseSeverity": "HIGH",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
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"version": "4.0",
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{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-fgjj-px3w-67xx",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-fgjj-px3w-67xx"
},
{
"name": "https://github.com/traefik/traefik/pull/13580",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/pull/13580"
},
{
"name": "https://github.com/traefik/traefik/commit/a764166656f0cd337f917ac76315c381cca844f9",
"tags": [
"x_refsource_MISC"
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{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.25",
"tags": [
"x_refsource_MISC"
],
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},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.10",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.10"
}
],
"source": {
"advisory": "GHSA-fgjj-px3w-67xx",
"discovery": "UNKNOWN"
},
"title": "Traefik: Gateway API route identity collision allows cross-namespace backend hijacking"
}
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"cveMetadata": {
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"dateReserved": "2026-08-05T18:14:42.065Z",
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"state": "PUBLISHED"
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CVE-2026-71326 (GCVE-0-2026-71326)
Vulnerability from cvelistv5
Published
2026-08-06 16:34
Modified
2026-08-08 02:12
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-287 - Improper Authentication
Summary
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||
Impacted products
{
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"id": "CVE-2026-71326",
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},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-08T02:12:30.362636Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003e= 3.6.11, \u003c 3.6.25"
},
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"version": "\u003e= 3.7.0, \u003c 3.7.10"
}
]
}
],
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}
],
"metrics": [
{
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"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 2.1,
"baseSeverity": "LOW",
"privilegesRequired": "HIGH",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
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}
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],
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},
{
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"tags": [
"x_refsource_MISC"
],
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},
{
"name": "https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.25",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.25"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.10",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.10"
}
],
"source": {
"advisory": "GHSA-6765-c87h-8mrf",
"discovery": "UNKNOWN"
},
"title": "Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing"
}
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"dateReserved": "2026-08-05T18:14:42.065Z",
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"state": "PUBLISHED"
},
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"dataVersion": "5.2"
}
CVE-2026-71325 (GCVE-0-2026-71325)
Vulnerability from cvelistv5
Published
2026-08-06 16:24
Modified
2026-08-07 17:09
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace's backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||
Impacted products
{
"containers": {
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{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-07T15:34:06.328209Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
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"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.54"
},
{
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"version": "\u003e= 3.0.0, \u003c 3.6.25"
},
{
"status": "affected",
"version": "\u003e= 3.7.0, \u003c 3.7.10"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Traefik is an open-source edge router that makes publishing services a fun and easy experience. Prior to 2.11.54, 3.6.25, and 3.7.10, cross-namespace @kubernetescrd references are not rejected for TraefikService backend references resolved by the service resolver. A tenant confined by RBAC to a single namespace can therefore bind its own router to a TraefikService owned by another namespace and expose or reroute that namespace\u0027s backend, defeating the namespace isolation allowCrossNamespace=false is meant to enforce. This issue is fixed in version 2.11.54, 3.6.25, 3.7.10."
}
],
"metrics": [
{
"cvssV4_0": {
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"attackRequirements": "NONE",
"attackVector": "LOCAL",
"baseScore": 4.8,
"baseSeverity": "MEDIUM",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
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"vulnIntegrityImpact": "LOW"
}
}
],
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}
]
},
{
"descriptions": [
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"cweId": "CWE-863",
"description": "CWE-863: Incorrect Authorization",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
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},
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],
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{
"name": "https://github.com/traefik/traefik/commit/65ebf4b47fbdc33e3856803a5844a404e094d52d",
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],
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},
{
"name": "https://github.com/traefik/traefik/releases/tag/v2.11.54",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v2.11.54"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.6.25",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.6.25"
},
{
"name": "https://github.com/traefik/traefik/releases/tag/v3.7.10",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/releases/tag/v3.7.10"
}
],
"source": {
"advisory": "GHSA-62fc-8686-hfmq",
"discovery": "UNKNOWN"
},
"title": "Traefik: `allowCrossNamespace=false` bypass via `@kubernetescrd` TraefikService backendRef"
}
},
"cveMetadata": {
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}
CVE-2026-71324 (GCVE-0-2026-71324)
Vulnerability from cvelistv5
Published
2026-08-06 15:56
Modified
2026-08-07 15:43
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Summary
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNECT with a keep-alive non-2xx response and does not drain the body, Traefik returns the desynchronized backend socket to its shared pool and reuses it for other clients. An unauthenticated attacker can use this behavior to make a different client read the attacker's smuggled response, which can include authenticated or private content from another request. The ForwardAuth middleware with forwardBody true and preserveRequestMethod true can re-issue a CONNECT with the buffered body attached, exposing the auth-client pool to the same desynchronization. This issue is fixed in 2.11.53, 3.6.24, and 3.7.9.
References
| URL | Tags | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
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"content": {
"id": "CVE-2026-71324",
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},
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-07T15:43:12.863387Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-07T15:43:19.812Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
"product": "traefik",
"vendor": "traefik",
"versions": [
{
"status": "affected",
"version": "\u003c 2.11.53"
},
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.6.24"
},
{
"status": "affected",
"version": "\u003e= 3.7.0, \u003c 3.7.9"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik\u0027s default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNECT with a keep-alive non-2xx response and does not drain the body, Traefik returns the desynchronized backend socket to its shared pool and reuses it for other clients. An unauthenticated attacker can use this behavior to make a different client read the attacker\u0027s smuggled response, which can include authenticated or private content from another request. The ForwardAuth middleware with forwardBody true and preserveRequestMethod true can re-issue a CONNECT with the buffered body attached, exposing the auth-client pool to the same desynchronization. This issue is fixed in 2.11.53, 3.6.24, and 3.7.9."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-444",
"description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
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},
"references": [
{
"name": "https://github.com/traefik/traefik/security/advisories/GHSA-3ccp-42pg-hgv6",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-3ccp-42pg-hgv6"
},
{
"name": "https://github.com/traefik/traefik/pull/13542",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/pull/13542"
},
{
"name": "https://github.com/traefik/traefik/pull/13543",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/pull/13543"
},
{
"name": "https://github.com/traefik/traefik/pull/13556",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/traefik/traefik/pull/13556"
},
{
"name": "https://github.com/traefik/traefik/commit/04d36f28e4eae7535e96a6351dd9f7bfb48a30e7",
"tags": [
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CVE-2026-67309 (GCVE-0-2026-67309)
Vulnerability from cvelistv5
Published
2026-08-01 12:22
Modified
2026-08-03 16:00
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Summary
Traefik versions >= v3.7.0 and <= v3.7.7 contain a path traversal vulnerability in the Kubernetes Ingress NGINX provider's RewriteTarget middleware (generated from the nginx.ingress.kubernetes.io/rewrite-target annotation). When an Ingress path uses a regex that captures attacker-controlled text without requiring a path separator (e.g., path /api(.*) with rewrite target /$1), a crafted request such as /api../admin matches the public router, is rewritten to a dot-segment traversal path (/../admin), and is forwarded without post-replacement normalization validation. A backend that normalizes dot segments resolves the path to a protected endpoint (e.g., /admin) reachable only through a separate router secured with BasicAuth, DigestAuth, or ForwardAuth, resulting in route-level authentication bypass. The issue is fixed in v3.7.8.
References
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CVE-2026-65602 (GCVE-0-2026-65602)
Vulnerability from cvelistv5
Published
2026-07-22 11:21
Modified
2026-07-24 21:35
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-863 - Incorrect Authorization
Summary
Traefik 3.6.0 through 3.6.22 and 3.7.0 through 3.7.6 fail to enforce the crossProviderNamespaces allowlist for IngressRouteTCP service serversTransport references (the allowlist was only enforced for HTTP serversTransport references). A low-privileged Kubernetes user in a namespace not listed in crossProviderNamespaces can set serversTransport: foo@file on an IngressRouteTCP service, causing Traefik to accept the forbidden cross-provider reference and use a file-provider TCPServersTransport — including privileged backend mTLS client certificates, SPIFFE identity, or PROXY-protocol settings. This is fixed in 3.6.23 and 3.7.7.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
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CVE-2026-65601 (GCVE-0-2026-65601)
Vulnerability from cvelistv5
Published
2026-07-22 11:21
Modified
2026-07-24 21:35
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-863 - Incorrect Authorization
Summary
Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.
References
| URL | Tags | |
|---|---|---|
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CVE-2026-65600 (GCVE-0-2026-65600)
Vulnerability from cvelistv5
Published
2026-07-22 11:21
Modified
2026-07-23 19:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Summary
Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.
References
| URL | Tags | |
|---|---|---|
Impacted products
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CVE-2026-54763 (GCVE-0-2026-54763)
Vulnerability from cvelistv5
Published
2026-07-06 20:33
Modified
2026-07-08 19:42
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
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CVE-2026-54765 (GCVE-0-2026-54765)
Vulnerability from cvelistv5
Published
2026-07-06 20:27
Modified
2026-07-07 14:19
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Traefik is an open source HTTP reverse proxy and load balancer. From v3.7.0 prior to v3.7.6, Traefik's Kubernetes Gateway API provider may resolve two accepted HTTPRoutes that target the same backend Service:port but configure different backendRef filters to the same child service and apply only one route's filter set to all requests reaching that backend. In Gateway deployments where backendRef filters set security-sensitive headers, such as tenant identity, authorization context, or values the backend trusts, an attacker who can create an accepted HTTPRoute sharing the same backend Service:port may cause their route's filter context to be applied to another route's requests, potentially crossing namespace boundaries when a ReferenceGrant permits cross-namespace targeting. This issue is fixed in version v3.7.6.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
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CVE-2026-54764 (GCVE-0-2026-54764)
Vulnerability from cvelistv5
Published
2026-07-06 20:20
Modified
2026-07-07 14:03
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
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CVE-2026-54762 (GCVE-0-2026-54762)
Vulnerability from cvelistv5
Published
2026-06-23 19:17
Modified
2026-06-24 12:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Traefik is an HTTP reverse proxy and load balancer. From 3.7.0-ea.1 until 3.7.5, there is a medium severity vulnerability in Traefik's Kubernetes Ingress NGINX provider that causes affected routes to fail open. When an Ingress explicitly enables BasicAuth or DigestAuth through the supported nginx.ingress.kubernetes.io/auth-type and auth-secret annotations, but the referenced auth Secret cannot be resolved or parsed, Traefik logs the resolution error, skips installing the authentication middleware, and still emits a router to the backend service. A route that operators intended to protect is therefore published to the data plane without its authentication control, allowing unauthenticated access to the backend. The trigger is an invalid or unresolved auth dependency — a missing, malformed, unreadable, or policy-denied Secret — rather than an intentionally unprotected route. This vulnerability is fixed in 3.7.5.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
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CVE-2026-54761 (GCVE-0-2026-54761)
Vulnerability from cvelistv5
Published
2026-06-23 19:15
Modified
2026-06-25 12:45
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple (WRR) backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own namespace. As a result, an HTTPRoute created in a namespace that is not allow-listed can reference a cross-provider TraefikService such as api@internal, dashboard@internal or rest@internal by pointing backendRef.namespace at an allow-listed namespace covered by a Gateway API ReferenceGrant, exposing internal Traefik services on the data plane. Exploitation requires the ability to create an accepted HTTPRoute and a matching ReferenceGrant from an allow-listed namespace; it does not require any change to Traefik static configuration, RBAC, or the deployment itself. This vulnerability is fixed in 3.6.21 and 3.7.5.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
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CVE-2026-53622 (GCVE-0-2026-53622)
Vulnerability from cvelistv5
Published
2026-06-23 19:13
Modified
2026-07-15 00:44
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to 3.7.3, there is a critical vulnerability in Traefik's HTTP/3 (QUIC) TLS configuration selection that allows unauthenticated clients to bypass router-specific mTLS enforcement. When HTTP/3 is enabled on an entrypoint, the TLS handshake selects the applicable TLS configuration through an exact, case-sensitive lookup on the SNI value, which fails to match wildcard host patterns (e.g., *.example.com) or case variants of the configured hostname. Because the handshake falls back to the default TLS configuration — which may not require client certificates — a client can complete the QUIC handshake without presenting a certificate, while the subsequent HTTP routing layer still dispatches the request to a backend protected by a router-specific mTLS policy. The issue affects deployments where HTTP/3 is enabled, a router uses a wildcard Host rule or case-insensitive hostname matching, a router-specific TLSOptions enforces client certificate authentication, and UDP access to the entrypoint is reachable by an attacker. This vulnerability is fixed in 3.7.3.
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
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CVE-2026-48491 (GCVE-0-2026-48491)
Vulnerability from cvelistv5
Published
2026-06-23 19:12
Modified
2026-07-15 00:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Summary
Traefik is an HTTP reverse proxy and load balancer. From 3.7.0 until 3.7.3, there is a high severity vulnerability in Traefik's domain-fronting protection (SNICheck) that allows an unauthenticated client to bypass mutual TLS enforced through wildcard router TLSOptions. When a router uses a wildcard host rule such as Host(*.example.com) with stricter TLS options (for example RequireAndVerifyClientCert), SNICheck resolves the TLS options for the HTTP Host header using exact map lookups only and never applies wildcard matching. If another permissive SNI is served on the same entrypoint, an attacker can complete the TLS handshake under the permissive options and then send an HTTP Host header targeting the wildcard-protected backend, reaching it without presenting a client certificate. This affects the regular HTTPS / HTTP-2 path and does not require HTTP/3. This vulnerability is fixed in 3.7.3.
References
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CVE-2026-48020 (GCVE-0-2026-48020)
Vulnerability from cvelistv5
Published
2026-06-23 19:10
Modified
2026-07-15 00:48
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.48, 3.6.19, and 3.7.3, there is a high severity vulnerability in Traefik's StripPrefix middleware that allows an unauthenticated attacker to bypass route-level authentication and authorization. When a public router matches on a PathPrefix rule and applies the StripPrefix middleware, a request path containing .. or its percent-encoded form %2e%2e can match the public route at routing time and then, after the prefix is stripped and the path is normalized, resolve to a path served by a separate, authenticated router. As a result, an attacker can reach protected backend paths — such as admin or internal configuration endpoints — without satisfying the authentication middleware attached to the protected router. This vulnerability is fixed in 2.11.48, 3.6.19, and 3.7.3.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2023-54365 (GCVE-0-2023-54365)
Vulnerability from cvelistv5
Published
2026-06-23 12:12
Modified
2026-07-15 01:27
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
VLAI Severity ?
EPSS score ?
CWE
- CWE-400 - Uncontrolled Resource Consumption
Summary
Traefik before 2.10.5 and 3.0.0-beta4 is affected by a denial-of-service vulnerability in HTTP/2 request handling inherited from the Go standard library's HTTP/2 implementation (CVE-2023-44487 / CVE-2023-39325, the 'Rapid Reset' technique). A remote attacker can rapidly create and cancel HTTP/2 streams to exhaust server resources and cause service unavailability.
References
| URL | Tags | |
|---|---|---|
Impacted products
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CVE-2026-44774 (GCVE-0-2026-44774)
Vulnerability from cvelistv5
Published
2026-05-15 16:30
Modified
2026-08-13 12:04
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-284 - Improper Access Control
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.46, 3.6.17, and 3.7.1, Traefik's Kubernetes Gateway API provider allows a tenant with HTTPRoute creation permissions to expose the REST provider handler, bypassing the providers.rest.insecure=false setting. The Gateway provider accepts any TraefikService backend reference whose name ends with @internal, making it possible to route traffic to rest@internal in addition to the intended api@internal. In shared Gateway deployments where the REST provider is enabled, this allows a low-privileged actor to gain live dynamic configuration write access to Traefik, enabling unauthorized reconfiguration of routers and services. This vulnerability is fixed in 2.11.46, 3.6.17, and 3.7.1.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2026-41181 (GCVE-0-2026-41181)
Vulnerability from cvelistv5
Published
2026-05-15 16:27
Modified
2026-05-16 01:11
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-201 - Insertion of Sensitive Information Into Sent Data
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to 2.11.44, 3.6.15, and 3.7.0-rc.3, there is an information disclosure vulnerability in Traefik's errors (custom error pages) middleware. When the backend returns a response matching the configured status range, the middleware forwards the original request's complete header set, including Authorization, Cookie, and other authentication material, to the separate error page service rather than only the minimal context needed to render the error page. This behavior is undocumented: the documentation states only that Host is forwarded by default, so operators are not warned that sensitive credentials are shared across service boundaries. Deployments using the errors middleware with a distinct error page service may inadvertently expose end-user credentials to infrastructure that was not intended to receive them. This vulnerability is fixed in 2.11.44, 3.6.15, and 3.7.0-rc.3.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2026-41263 (GCVE-0-2026-41263)
Vulnerability from cvelistv5
Published
2026-04-30 20:39
Modified
2026-05-01 14:22
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-208 - Observable Timing Discrepancy
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a timing side-channel vulnerability in Traefik's BasicAuth middleware that allows an attacker to enumerate valid usernames through response-time differences. The variable intended to hold a constant-time fallback secret always resolves to an empty string, causing the constant-time comparison to short-circuit in microseconds rather than performing a full bcrypt evaluation. This restores the original timing oracle and makes it possible to distinguish existing users from non-existing ones by measuring authentication response times. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2026-40912 (GCVE-0-2026-40912)
Vulnerability from cvelistv5
Published
2026-04-30 20:38
Modified
2026-07-15 01:00
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-706 - Use of Incorrectly-Resolved Name or Reference
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's StripPrefixRegex middleware when used in combination with ForwardAuth, BasicAuth, or DigestAuth. The middleware matches the regex against the decoded URL path but uses the resulting byte length to slice the percent-encoded raw path. When a dot (or multiple dots) appears in the prefix portion of the URL, the raw path after stripping becomes a dot-segment (e.g. /./admin/secret). ForwardAuth receives this dot-segment path in X-Forwarded-Uri, which does not match the protected path patterns and therefore allows the request through. The backend then normalizes the dot-segment to the real path per RFC 3986 and serves the protected content An unauthenticated attacker can exploit this against any backend that performs dot-segment normalization. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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CVE-2026-39858 (GCVE-0-2026-39858)
Vulnerability from cvelistv5
Published
2026-04-30 20:26
Modified
2026-07-15 01:01
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a high severity authentication bypass vulnerability in Traefik's ForwardAuth and snippet-based authentication middleware. Traefik's forwarded-header sanitization logic targets only canonical header names (e.g., X-Forwarded-Proto) and does not strip or normalize alias variants that use underscores instead of dashes (e.g., X_Forwarded_Proto). These unsanitized alias headers are forwarded intact to the authentication backend. When the backend normalizes underscore and dash header forms equivalently, an attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers and bypass authentication on protected routes without valid credentials. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2026-35051 (GCVE-0-2026-35051)
Vulnerability from cvelistv5
Published
2026-04-30 20:26
Modified
2026-07-15 01:03
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2026-41174 (GCVE-0-2026-41174)
Vulnerability from cvelistv5
Published
2026-04-30 20:20
Modified
2026-05-04 13:26
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is a potential vulnerability in Traefik's Kubernetes CRD provider cross-namespace isolation enforcement. When providers.kubernetesCRD.allowCrossNamespace=false, Traefik correctly rejects direct cross-namespace middleware references from IngressRoute objects, but fails to apply the same restriction to middleware references nested inside a Chain middleware's spec.chain.middlewares[]. An actor with permission to create or update Traefik CRDs in their own namespace can exploit this to cause Traefik to resolve and apply middleware objects from another namespace, bypassing the documented isolation boundary. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
References
| URL | Tags | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||
Impacted products
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CVE-2026-33433 (GCVE-0-2026-33433)
Vulnerability from cvelistv5
Published
2026-03-27 13:49
Modified
2026-07-15 01:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-290 - Authentication Bypass by Spoofing
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.42, 3.6.11, and 3.7.0-ea.3, when `headerField` is configured with a non-canonical HTTP header name (e.g., `x-auth-user` instead of `X-Auth-User`), an authenticated attacker can inject their own canonical version of that header to impersonate any identity to the backend. The backend receives two header entries — the attacker-injected canonical one is read first, overriding Traefik's non-canonical write. Versions 2.11.42, 3.6.11, and 3.7.0-ea.3 patch the issue.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2026-32695 (GCVE-0-2026-32695)
Vulnerability from cvelistv5
Published
2026-03-27 13:47
Modified
2026-07-15 01:07
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 3.6.11 and 3.7.0-ea.2, Traefik's Knative provider builds router rules by interpolating user-controlled values into backtick-delimited rule expressions without escaping. In live cluster validation, Knative `rules[].hosts[]` was exploitable for host restriction bypass (for example `tenant.example.com`) || Host(`attacker.com`), producing a router that serves attacker-controlled hosts. Knative `headers[].exact` also allows rule-syntax injection and proves unsafe rule construction. In multi-tenant clusters, this can route unauthorized traffic to victim services and lead to cross-tenant traffic exposure. Versions 3.6.11 and 3.7.0-ea.2 patch the issue.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Impacted products
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CVE-2026-32595 (GCVE-0-2026-32595)
Vulnerability from cvelistv5
Published
2026-03-20 10:08
Modified
2026-03-20 15:38
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-208 - Observable Timing Discrepancy
Summary
Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 comtain BasicAuth middleware that allows username enumeration via a timing attack. When a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Impacted products
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CVE-2026-32305 (GCVE-0-2026-32305)
Vulnerability from cvelistv5
Published
2026-03-20 10:01
Modified
2026-07-15 01:08
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Traefik is an HTTP reverse proxy and load balancer. Versions 2.11.40 and below, 3.0.0-beta1 through 3.6.11, and 3.7.0-ea.1 are vulnerable to mTLS bypass through the TLS SNI pre-sniffing logic related to fragmented ClientHello packets. When a TLS ClientHello is fragmented across multiple records, Traefik's SNI extraction may fail with an EOF and return an empty SNI. The TCP router then falls back to the default TLS configuration, which does not require client certificates by default. This allows an attacker to bypass route-level mTLS enforcement and access services that should require mutual TLS authentication. This issue is patched in versions 2.11.41, 3.6.11 and 3.7.0-ea.2.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
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Impacted products
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CVE-2026-29777 (GCVE-0-2026-29777)
Vulnerability from cvelistv5
Published
2026-03-11 15:54
Modified
2026-03-11 17:22
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Summary
Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, A tenant with write access to an HTTPRoute resource can inject backtick-delimited rule tokens into Traefik's router rule language via unsanitized header or query parameter match values. In shared gateway deployments, this can bypass listener hostname constraints and redirect traffic for victim hostnames to attacker-controlled backends. This vulnerability is fixed in 3.6.10.
References
| URL | Tags | |||||||
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CVE-2026-29054 (GCVE-0-2026-29054)
Vulnerability from cvelistv5
Published
2026-03-05 16:18
Modified
2026-07-15 01:10
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-178 - Improper Handling of Case Sensitivity
Summary
Traefik is an HTTP reverse proxy and load balancer. From version 2.11.9 to 2.11.37 and from version 3.1.3 to 3.6.8, there is a potential vulnerability in Traefik managing the Connection header with X-Forwarded headers. When Traefik processes HTTP/1.1 requests, the protection put in place to prevent the removal of Traefik-managed X-Forwarded headers (such as X-Real-Ip, X-Forwarded-Host, X-Forwarded-Port, etc.) via the Connection header does not handle case sensitivity correctly. The Connection tokens are compared case-sensitively against the protected header names, but the actual header deletion operates case-insensitively. As a result, a remote unauthenticated client can use lowercase Connection tokens (e.g. Connection: x-real-ip) to bypass the protection and trigger the removal of Traefik-managed forwarded identity headers. This issue has been patched in versions 2.11.38 and 3.6.9.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
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