{"id":"CVE-2026-114639","summary":"Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool","details":"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.","aliases":["GHSA-qm9f-w54v-q2qh"],"modified":"2026-10-22T10:46:10.102499751Z","published":"2026-10-22T01:43:39.232Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114639.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-287"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114639.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114639"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"0c8778639a3cade0cf73aa26f56f822a4fb835e8"},{"fixed":"246d9bfe790fcd91088e25121054871e1aac1000"},{"introduced":"d99d2f95e66a28ee8180634dc80fdf13ba68c62a"},{"fixed":"3bd7aa32e1b6c41166575529a10fb2346d9eaa2e"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"2.11.0"},{"fixed":"2.11.58"}],"source":"AFFECTED_FIELD"},{"range":[{"introduced":"3.0.0"},{"fixed":"3.7.14"}],"source":"AFFECTED_FIELD","strategy":"StandardRange"}]}}],"versions":["v2.11.57","v2.11.56","v2.11.55","v2.11.54","v2.11.53","v2.11.52","v2.11.51","v2.11.50","v2.11.49","v2.11.48","v2.11.47","v2.11.46","v2.11.45","v2.11.44","v2.11.43","v2.11.42","v2.11.41","v2.11.40","v2.11.39","v2.11.38","v2.11.37","v2.11.36","v2.11.35","v2.11.34","v2.11.33","v2.11.32","v2.11.31","v2.11.30","v2.11.29","v2.11.28","v2.11.27","v2.11.26","v2.11.25","v2.11.24","v2.11.23","v2.11.22","v2.11.21","v2.11.20","v2.11.19","v2.11.18","v2.11.17","v2.11.16","v2.11.15","v2.11.14","v2.11.13","v2.11.12","v2.11.11","v2.11.10","v2.11.9","v2.11.8","v2.11.7","v2.11.6","v2.11.5","v2.11.4","v2.11.3","v2.11.2","v2.11.1","v2.11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-114639.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}