{"id":"CVE-2026-35051","aliases":["GHSA-6384-m2mw-rf54","GO-2026-5163"],"url":"https://o3.security/vulnerability/CVE-2026-35051","summary":"Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth","details":"Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.","published":"2026-04-30T20:26:06.716Z","modified":"2026-08-07T11:50:56.032523677Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","fixedVersion":"3.7.0-rc.2"},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","fixedVersion":"3.6.14"},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","fixedVersion":"2.11.43"},{"ecosystem":"Go","name":"github.com/traefik/traefik","fixedVersion":null}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v2.11.43"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v3.6.14"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35051.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:21772"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-35051"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35051.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35051"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2464235"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:56.032523677Z"}}