{"id":"CVE-2026-114656","title":"Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher","summary":"Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because negated Host matchers are counted as served domains. Attackers can reach back…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N","cvssSource":"cna","cwe":["CWE-436"],"vendor":"traefik","product":"traefik","affected":["traefik < 2.11.58","traefik >= 3.0.0 < 3.7.13"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T01:43:42.056Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114656","references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww","label":"GitHub Security Advisory (GHSA-2272-4vv8-65ww)"},{"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher","label":"VulnCheck Advisory: Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T02:23:25.184Z","slug":"CVE-2026-114656","body":"## Overview\n\nTraefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because negated Host matchers are counted as served domains. Attackers can reach backends protected by RequireAndVerifyClientCert when a router rule with !Host() creates a TLS options conflict that falls back to the default options.\n\n## Affected\n\n- `traefik < 2.11.58`\n- `traefik >= 3.0.0 < 3.7.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}