{"id":"CVE-2026-114642","summary":"Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripper","details":"Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not keyed by ServersTransport, so one service's TLS client configuration is reused for another service's backend. An unauthenticated client can arm the slot via a backend issuing an NTLM or Negotiate challenge, then reach another service on the same keep-alive connection, bypassing its root CAs, server name, and certificate verification.","aliases":["GHSA-cw35-4q88-3rmp"],"modified":"2026-10-22T10:45:53.614782135Z","published":"2026-10-22T01:43:41.355Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-295"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114642.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114642.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-cw35-4q88-3rmp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114642"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-tls-config-bypass-via-ntlm-kerberos-round-tripper"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"0c8778639a3cade0cf73aa26f56f822a4fb835e8"},{"fixed":"246d9bfe790fcd91088e25121054871e1aac1000"},{"introduced":"d99d2f95e66a28ee8180634dc80fdf13ba68c62a"},{"fixed":"3bd7aa32e1b6c41166575529a10fb2346d9eaa2e"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"StandardRange","range":[{"introduced":"2.11.0"},{"fixed":"2.11.58"}]},{"strategy":"StandardRange","range":[{"introduced":"3.0.0"},{"fixed":"3.7.14"}],"source":"AFFECTED_FIELD"}]}}],"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-2026-114642.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"}]}