{"id":"CVE-2026-65601","title":"Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider","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 namespa…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-863"],"vendor":"traefik","product":"traefik","affected":["traefik >= 3.7.0, < 3.7.7"],"patched":["traefik 3.7.7"],"published":"2026-07-22","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:29.010","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-65601","references":[{"url":"https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref","label":"disclosure@vulncheck.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65601"},{"url":"https://github.com/traefik/traefik/pull/13462"},{"url":"https://github.com/traefik/traefik/commit/655d6324ab4a1475892a958d4bae389720a67ea9"},{"url":"https://github.com/advisories/GHSA-qq9q-x9w4-chhj"}],"tags":["nvd","cve.org","ghsa","go","score-dispute"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-23T13:51:09.038759Z"},"scores":{"nvd":8.8,"cna":5.3},"epss":0.00512,"epssPercentile":0.43456,"aliases":["GHSA-qq9q-x9w4-chhj"],"ecosystem":"go","ingestedAt":"2026-08-05T21:52:35.646Z","slug":"CVE-2026-65601","body":"## Overview\n\nTraefik 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.\n\n## Affected\n\n- `traefik >= 3.7.0, < 3.7.7`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `traefik 3.7.7`\n\n## Package advisory (CVE-2026-65601)\n\nAffected packages:\n\n- `Traefik >= 3.7.0, < 3.7.7`\n\nPatched in:\n\n- `Traefik 3.7.7`\n\nSource: https://github.com/advisories/GHSA-qq9q-x9w4-chhj","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":218135,"id":"CVE-2026-65601","ts":1791478425972,"field":"cvss","old":null,"new":"8.8"},{"seq":218134,"id":"CVE-2026-65601","ts":1791478425972,"field":"severity","old":"medium","new":"high"}]}