{"affected":[{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/traefik/traefik/v2","product":"traefik","source":"CNA: VulnCheck","vendor":"traefik","versions":[{"lessThan":"2.11.58","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"2.11.58","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"golang","packageName":"github.com/traefik/traefik/v3","product":"traefik","source":"CNA: VulnCheck","vendor":"traefik","versions":[{"lessThan":"3.7.13","status":"affected","version":"3.0.0","versionType":"semver"},{"status":"unaffected","version":"3.7.13","versionType":"semver"}]}],"cpeConfigurations":[{"negate":false,"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionEndExcluding":"2.11.58","vulnerable":true},{"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionEndExcluding":"3.7.13","versionStartIncluding":"3.0.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"cveId":"CVE-2026-114656","cwes":["CWE-436"],"description":"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 backends protected by RequireAndVerifyClientCert when a router rule with !Host() creates a TLS options conflict that falls back to the default options.","epss":{"date":"2026-11-04","percentile":0.04601,"score":0.00154},"exploits":[],"kev":null,"metrics":[{"score":6.9,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N","version":"3.1"},{"score":6.9,"severity":"medium","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":9.3,"severity":"critical","source":"NVD: nvd@nist.gov","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N","version":"3.1"},{"score":7.5,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N","version":"3.1"}],"modifiedAt":1793809061910,"publishedAt":1792633422056,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher"},{"source":"disclosure@vulncheck.com","tags":["Patch","Vendor Advisory"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww"},{"source":"disclosure@vulncheck.com","tags":["Third Party Advisory"],"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher"}],"remediation":[{"kind":"fix","source":"disclosure@vulncheck.com","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww"}],"revision":"cad3e326648e4542c95c0712a985e5aca98f71605e7484dbe029a66ec528d4b8","sources":[{"modifiedAt":1793807933364,"name":"CNA: VulnCheck","retrievedAt":1793808581269,"url":"https://www.cve.org/CVERecord?id=CVE-2026-114656"},{"modifiedAt":1793809061910,"name":"NVD","retrievedAt":1793816315365,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114656"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793808600268,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114656"}],"ssvc":{"assessedAt":1793807921414,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher","updatedAt":1793816315365}