{"id":"CVE-2026-114637","summary":"Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak","details":"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. 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.","aliases":["GHSA-53qr-784g-cj35"],"modified":"2026-10-22T10:46:03.500695563Z","published":"2026-10-22T01:43:37.851Z","database_specific":{"cwe_ids":["CWE-488"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114637.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114637.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-53qr-784g-cj35"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-114637"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/traefik-3.2.0-before-3.7.14-fastproxy-ntlm-negotiate-connection-pool-identity-leak"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"25caa72c0972fcb829276ebf5a41ef0263fa4a6f"},{"fixed":"3bd7aa32e1b6c41166575529a10fb2346d9eaa2e"}],"database_specific":{"extracted_events":[{"strategy":"StandardRange","range":[{"introduced":"3.2.0"},{"fixed":"3.7.14"}],"source":"AFFECTED_FIELD"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-114637.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"}]}