{"id":"CVE-2026-85596","summary":"Traefik v3.7 Authentication Bypass via TLS Option Conflict","details":"Traefik versions \u003e= v3.7.0 and \u003c= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named after the Ingress namespace and name. As a result, two Ingress objects sharing the same host, the same client CA secret, and the same client-authentication mode produced two distinct TLS option names for that host. Traefik treats this as a TLS options conflict and falls back to the entry point's default TLS configuration, which does not request a client certificate, so a route configured with nginx.ingress.kubernetes.io/auth-tls-verify-client: \"on\" becomes reachable without a client certificate. Only the v3.7 line is affected; the issue is fixed in v3.7.11.","aliases":["GHSA-j994-9gqj-9hwq"],"modified":"2026-09-07T03:30:32.204855219Z","published":"2026-09-04T11:30:00.112Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-287"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85596.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85596.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-j994-9gqj-9hwq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85596"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/traefik-3.7-authentication-bypass-via-tls-option-conflict"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"04aa6bb4f9776f2ba87e5cd181d250e3610e6419"},{"last_affected":"2a2349356c01b1b1f7ecddb0c17b30c97f5241e7"}],"database_specific":{"extracted_events":[{"introduced":"3.7.0"},{"last_affected":"3.7.10"}],"source":"AFFECTED_FIELD"}}],"versions":["v3.7.10","v3.7.9","v3.7.8","v3.7.7","v3.7.6","v3.7.5","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85596.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:H/VI:N/VA:N/SC:N/SI:N/SA:N"}]}