{"id":"CVE-2026-114639","title":"Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool","summary":"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…","severity":"high","cvss":8.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-287"],"vendor":"traefik","product":"traefik","affected":["traefik >= 2.11.0 < 2.11.58","traefik >= 3.0.0 < 3.7.14"],"published":"2026-10-22","updated":"2026-10-22","sourceUpdated":"2026-10-22T01:43:39.232Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114639","references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh","label":"GitHub Security Advisory (GHSA-qm9f-w54v-q2qh)"},{"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool","label":"VulnCheck Advisory: Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool"}],"tags":["cve.org"],"ingestedAt":"2026-10-22T02:23:25.188Z","slug":"CVE-2026-114639","body":"## Overview\n\nTraefik 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.\n\n## Affected\n\n- `traefik >= 2.11.0 < 2.11.58`\n- `traefik >= 3.0.0 < 3.7.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":47.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}