{"id":"CVE-2026-65602","title":"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)","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 …","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 >= 3.6.0, < 3.6.23","traefik >= 3.7.0, < 3.7.7"],"patched":["traefik 3.7.7"],"published":"2026-07-22","updated":"2026-10-08","sourceUpdated":"2026-10-08T16:17:29.200","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-65602","references":[{"url":"https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-42cj-m3vj-89wv","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/traefik-before-ingressroutetcp-serverstransport-namespace-bypass","label":"disclosure@vulncheck.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65602"},{"url":"https://github.com/traefik/traefik/pull/13458"},{"url":"https://github.com/traefik/traefik/commit/67501cbe7bc7774e26ecbd1c29af97f098e14b0b"},{"url":"https://github.com/traefik/traefik/releases/tag/v3.6.23"},{"url":"https://github.com/traefik/traefik/releases/tag/v3.7.7"},{"url":"https://github.com/advisories/GHSA-42cj-m3vj-89wv"}],"tags":["nvd","cve.org","ghsa","go","score-dispute"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-07-22T13:04:30.399873Z"},"scores":{"nvd":8.8,"cna":5.3},"epss":0.00333,"epssPercentile":0.26349,"aliases":["GHSA-42cj-m3vj-89wv"],"ecosystem":"go","ingestedAt":"2026-08-05T22:52:54.071Z","slug":"CVE-2026-65602","body":"## Overview\n\nTraefik 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.\n\n## Affected\n\n- `traefik >= 3.6.0, < 3.6.23`\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-2026-65602)\n\nAffected packages:\n\n- `github.com/traefik/traefik/v3 >= 3.6.0, <= 3.6.22`\n- `github.com/traefik/traefik/v3 >= 3.7.0, <= 3.7.6`\n\nPatched in:\n\n- `github.com/traefik/traefik/v3 3.6.23`\n- `github.com/traefik/traefik/v3 3.7.7`\n\nSource: https://github.com/advisories/GHSA-42cj-m3vj-89wv","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":218137,"id":"CVE-2026-65602","ts":1791478426355,"field":"cvss","old":null,"new":"8.8"},{"seq":218136,"id":"CVE-2026-65602","ts":1791478426355,"field":"severity","old":"medium","new":"high"}]}