CVE-2026-105766 (GCVE-0-2026-105766)
Vulnerability from cvelistv5
Published
2026-10-05 19:45
Modified
2026-10-06 13:44
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-319 - Cleartext Transmission of Sensitive Information
Summary
Use of the backend-facing $scheme variable in the trailing-slash directory redirect in nginx.conf of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext http:// URL. Browsers that ship the HSTS preload list are not affected, because the .dev top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Chainguard | Chainguard Academy (edu) |
Version: 0b75ff98057f69b044a3e7194e428066ac5ad0d4 |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-105766",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-06T13:43:50.196822Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-10-06T13:44:09.303Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"modules": [
"Nginx trailing-slash directory redirect"
],
"product": "Chainguard Academy (edu)",
"programFiles": [
"nginx.conf"
],
"repo": "https://github.com/chainguard-dev/edu",
"vendor": "Chainguard",
"versions": [
{
"lessThan": "93dc0e50739c225f5aee2e803800a47fc0feb906",
"status": "affected",
"version": "0b75ff98057f69b044a3e7194e428066ac5ad0d4",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eTLS is terminated before requests reach Nginx (as in the production Cloud Run deployment), and the client following the redirect does not enforce HSTS for \u003ccode\u003eedu.chainguard.dev\u003c/code\u003e.\u003c/p\u003e"
}
],
"value": "TLS is terminated before requests reach Nginx (as in the production Cloud Run deployment), and the client following the redirect does not enforce HSTS for edu.chainguard.dev."
}
],
"credits": [
{
"lang": "en",
"type": "remediation developer",
"value": "Matthew Helmke (https://github.com/matthewhelmke)"
},
{
"lang": "en",
"type": "coordinator",
"value": "SunnyR (https://github.com/SunnyR)"
},
{
"lang": "en",
"type": "coordinator",
"value": "Chainguard (https://chainguard.dev)"
}
],
"datePublic": "2026-09-11T16:16:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eUse of the backend-facing \u003ccode\u003e$scheme\u003c/code\u003e variable in the trailing-slash directory redirect in \u003ccode\u003enginx.conf\u003c/code\u003e of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext \u003ccode\u003ehttp://\u003c/code\u003e URL. Browsers that ship the HSTS preload list are not affected, because the \u003ccode\u003e.dev\u003c/code\u003e top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.\u003c/p\u003e"
}
],
"value": "Use of the backend-facing $scheme variable in the trailing-slash directory redirect in nginx.conf of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext http:// URL. Browsers that ship the HSTS preload list are not affected, because the .dev top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected."
}
],
"impacts": [
{
"capecId": "CAPEC-94",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-94 Adversary in the Middle (AiTM)"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 2.3,
"baseSeverity": "LOW",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-319",
"description": "CWE-319 Cleartext Transmission of Sensitive Information",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-05T19:45:50.015Z",
"orgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178",
"shortName": "chainguard"
},
"references": [
{
"name": "Fix commit 93dc0e5",
"tags": [
"patch"
],
"url": "https://github.com/chainguard-dev/edu/commit/93dc0e50739c225f5aee2e803800a47fc0feb906"
},
{
"name": "chainguard-dev/edu#3989",
"tags": [
"patch"
],
"url": "https://github.com/chainguard-dev/edu/pull/3989"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eFixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the \u003ccode\u003ehttps\u003c/code\u003e scheme in the redirect. The fix is deployed to \u003ccode\u003eedu.chainguard.dev\u003c/code\u003e; no user action is required.\u003c/p\u003e"
}
],
"value": "Fixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the https scheme in the redirect. The fix is deployed to edu.chainguard.dev; no user action is required."
}
],
"source": {
"discovery": "INTERNAL"
},
"tags": [
"exclusively-hosted-service"
],
"timeline": [
{
"lang": "en",
"time": "2025-07-14T21:34:00.000Z",
"value": "Vulnerable redirect introduced (chainguard-dev/edu#2411)"
},
{
"lang": "en",
"time": "2026-09-11T16:16:00.000Z",
"value": "Fix merged (chainguard-dev/edu#3989)"
}
],
"title": "Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "82cea9a6-e9e3-46fe-bdb0-3673de380178",
"assignerShortName": "chainguard",
"cveId": "CVE-2026-105766",
"datePublished": "2026-10-05T19:45:50.015Z",
"dateReserved": "2026-10-05T19:21:04.930Z",
"dateUpdated": "2026-10-06T13:44:09.303Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"cna\": {\"tags\": [\"exclusively-hosted-service\"], \"title\": \"Chainguard Academy (edu) Nginx directory redirect downgrades HTTPS requests to HTTP\", \"source\": {\"discovery\": \"INTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Matthew Helmke (https://github.com/matthewhelmke)\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"SunnyR (https://github.com/SunnyR)\"}, {\"lang\": \"en\", \"type\": \"coordinator\", \"value\": \"Chainguard (https://chainguard.dev)\"}], \"impacts\": [{\"capecId\": \"CAPEC-94\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-94 Adversary in the Middle (AiTM)\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 2.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N\", \"exploitMaturity\": \"NOT_DEFINED\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"PASSIVE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"LOW\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"format\": \"CVSS\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 3.1, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"repo\": \"https://github.com/chainguard-dev/edu\", \"vendor\": \"Chainguard\", \"modules\": [\"Nginx trailing-slash directory redirect\"], \"product\": \"Chainguard Academy (edu)\", \"versions\": [{\"status\": \"affected\", \"version\": \"0b75ff98057f69b044a3e7194e428066ac5ad0d4\", \"lessThan\": \"93dc0e50739c225f5aee2e803800a47fc0feb906\", \"versionType\": \"git\"}], \"programFiles\": [\"nginx.conf\"], \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2025-07-14T21:34:00.000Z\", \"value\": \"Vulnerable redirect introduced (chainguard-dev/edu#2411)\"}, {\"lang\": \"en\", \"time\": \"2026-09-11T16:16:00.000Z\", \"value\": \"Fix merged (chainguard-dev/edu#3989)\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Fixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the https scheme in the redirect. The fix is deployed to edu.chainguard.dev; no user action is required.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eFixed in commit 93dc0e50739c225f5aee2e803800a47fc0feb906, which hardcodes the \u003ccode\u003ehttps\u003c/code\u003e scheme in the redirect. The fix is deployed to \u003ccode\u003eedu.chainguard.dev\u003c/code\u003e; no user action is required.\u003c/p\u003e\", \"base64\": false}]}], \"datePublic\": \"2026-09-11T16:16:00.000Z\", \"references\": [{\"url\": \"https://github.com/chainguard-dev/edu/commit/93dc0e50739c225f5aee2e803800a47fc0feb906\", \"name\": \"Fix commit 93dc0e5\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/chainguard-dev/edu/pull/3989\", \"name\": \"chainguard-dev/edu#3989\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"Vulnogram 1.0.5\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Use of the backend-facing $scheme variable in the trailing-slash directory redirect in nginx.conf of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext http:// URL. Browsers that ship the HSTS preload list are not affected, because the .dev top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eUse of the backend-facing \u003ccode\u003e$scheme\u003c/code\u003e variable in the trailing-slash directory redirect in \u003ccode\u003enginx.conf\u003c/code\u003e of Chainguard Academy (edu) from commit 0b75ff98057f69b044a3e7194e428066ac5ad0d4 before commit 93dc0e50739c225f5aee2e803800a47fc0feb906 allows an on-path network attacker to read or modify documentation content served to a victim via an HTTPS request for a slashless directory path, because TLS terminates at the load balancer in front of Nginx and the resulting 301 response redirects the client to a plaintext \u003ccode\u003ehttp://\u003c/code\u003e URL. Browsers that ship the HSTS preload list are not affected, because the \u003ccode\u003e.dev\u003c/code\u003e top-level domain is preloaded; clients that do not enforce HSTS, such as command-line HTTP clients and scripts that follow redirects, are affected.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-319\", \"description\": \"CWE-319 Cleartext Transmission of Sensitive Information\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"TLS is terminated before requests reach Nginx (as in the production Cloud Run deployment), and the client following the redirect does not enforce HSTS for edu.chainguard.dev.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eTLS is terminated before requests reach Nginx (as in the production Cloud Run deployment), and the client following the redirect does not enforce HSTS for \u003ccode\u003eedu.chainguard.dev\u003c/code\u003e.\u003c/p\u003e\", \"base64\": false}]}], \"providerMetadata\": {\"orgId\": \"82cea9a6-e9e3-46fe-bdb0-3673de380178\", \"shortName\": \"chainguard\", \"dateUpdated\": \"2026-10-05T19:45:50.015Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-105766\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-06T13:43:50.196822Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-10-06T13:43:56.582Z\"}}]}",
"cveMetadata": "{\"cveId\": \"CVE-2026-105766\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-05T19:45:50.015Z\", \"dateReserved\": \"2026-10-05T19:21:04.930Z\", \"assignerOrgId\": \"82cea9a6-e9e3-46fe-bdb0-3673de380178\", \"datePublished\": \"2026-10-05T19:45:50.015Z\", \"assignerShortName\": \"chainguard\"}",
"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…