{"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":"2.11.0","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":"3.7.14","status":"affected","version":"3.0.0","versionType":"semver"},{"status":"unaffected","version":"3.7.14","versionType":"semver"}]}],"cpeConfigurations":[{"negate":false,"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionEndExcluding":"2.11.58","versionStartIncluding":"2.11.0","vulnerable":true},{"criteria":"cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*","versionEndExcluding":"3.7.14","versionStartIncluding":"3.0.0","vulnerable":true}],"negate":false,"operator":"OR"}],"operator":"OR"}],"cveId":"CVE-2026-114639","cwes":["CWE-287"],"description":"Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.","epss":{"date":"2026-11-04","percentile":0.22276,"score":0.00295},"exploits":[],"kev":null,"metrics":[{"score":7,"severity":"high","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:H/SA:N","version":"4.0"},{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},{"score":7,"severity":"high","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:H/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":8.7,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","version":"3.1"}],"modifiedAt":1793809061760,"publishedAt":1792633419232,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool"},{"source":"disclosure@vulncheck.com","tags":["Vendor Advisory"],"url":"https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh"},{"source":"disclosure@vulncheck.com","tags":["Third Party Advisory"],"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool"}],"remediation":[],"revision":"905cf9cd734b61a3afe972790d31f5ca395a2212b4982284b2e3ed68b4454164","sources":[{"modifiedAt":1793808011984,"name":"CNA: VulnCheck","retrievedAt":1793808580084,"url":"https://www.cve.org/CVERecord?id=CVE-2026-114639"},{"modifiedAt":1793809061760,"name":"NVD","retrievedAt":1793816314978,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114639"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793808600376,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114639"}],"ssvc":{"assessedAt":1793807999751,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool","updatedAt":1793816314978}