CVE-2026-62959 (GCVE-0-2026-62959)
Vulnerability from cvelistv5
Published
2026-07-31 19:57
Modified
2026-07-31 23:34
Severity ?
VLAI Severity ?
EPSS score ?
Summary
Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed→unsigned conversion. This issue is fixed in version 4.15.0.
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-62959",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-31T23:34:10.861030Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T23:34:33.361Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "coturn",
"vendor": "coturn",
"versions": [
{
"status": "affected",
"version": "\u003e= 4.5.2, \u003c 4.15.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect \u003cURL\u003e and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients\u0027 requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed\u2192unsigned conversion. This issue is fixed in version 4.15.0."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-125",
"description": "CWE-125: Out-of-bounds Read",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-195",
"description": "CWE-195: Signed to Unsigned Conversion Error",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T19:57:06.394Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g"
},
{
"name": "https://github.com/coturn/coturn/pull/1965",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/pull/1965"
},
{
"name": "https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4"
},
{
"name": "https://github.com/coturn/coturn/releases/tag/4.15.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/coturn/coturn/releases/tag/4.15.0"
}
],
"source": {
"advisory": "GHSA-m23x-5qf5-988g",
"discovery": "UNKNOWN"
},
"title": "Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-62959",
"datePublished": "2026-07-31T19:57:06.394Z",
"dateReserved": "2026-07-14T22:32:17.732Z",
"dateUpdated": "2026-07-31T23:34:33.361Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-62959\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-31T23:34:10.861030Z\"}}}], \"references\": [{\"url\": \"https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-31T23:34:29.009Z\"}}], \"cna\": {\"title\": \"Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)\", \"source\": {\"advisory\": \"GHSA-m23x-5qf5-988g\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"coturn\", \"product\": \"coturn\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 4.5.2, \u003c 4.15.0\"}]}], \"references\": [{\"url\": \"https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g\", \"name\": \"https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/coturn/coturn/pull/1965\", \"name\": \"https://github.com/coturn/coturn/pull/1965\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4\", \"name\": \"https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/coturn/coturn/releases/tag/4.15.0\", \"name\": \"https://github.com/coturn/coturn/releases/tag/4.15.0\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect \u003cURL\u003e and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients\u0027 requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed\\u2192unsigned conversion. This issue is fixed in version 4.15.0.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125: Out-of-bounds Read\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-195\", \"description\": \"CWE-195: Signed to Unsigned Conversion Error\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-07-31T19:57:06.394Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-62959\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-31T23:34:33.361Z\", \"dateReserved\": \"2026-07-14T22:32:17.732Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-07-31T19:57:06.394Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…