{"id":"CVE-2026-114637","title":"Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak","summary":"Traefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthent…","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-488"],"vendor":"traefik","product":"traefik","affected":["traefik >= 3.2.0 < 3.7.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-28T18:49:46.134711Z"},"published":"2026-10-22","updated":"2026-10-28","sourceUpdated":"2026-10-28T18:57:09.823Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-114637","references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35","label":"GitHub Security Advisory (GHSA-53qr-784g-cj35)"},{"url":"https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.14-fastproxy-ntlm-negotiate-connection-pool-identity-leak","label":"VulnCheck Advisory: Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak"}],"tags":["cve.org"],"epss":0.00284,"epssPercentile":0.20958,"ingestedAt":"2026-10-22T02:23:25.183Z","slug":"CVE-2026-114637","body":"## Overview\n\nTraefik from v3.2.0 before v3.7.14 contains an authentication bypass vulnerability in the experimental FastProxy connection pool, which fails to pin NTLM/Negotiate-authenticated backend connections to their frontend connection. Unauthenticated clients can be handed a pooled keep-alive backend connection where a victim completed an NTLM or Negotiate handshake, letting them read victim data and act as that victim.\n\n## Affected\n\n- `traefik >= 3.2.0 < 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":0.1,"exploitation":0,"ransomware":0},"changes":[]}