{"id":"GO-2026-5149","summary":"Traefik: Pre-authentication decision bypass due to forwarded alias spoofing in github.com/traefik/traefik","details":"Traefik: Pre-authentication decision bypass due to forwarded alias spoofing in github.com/traefik/traefik","aliases":["CVE-2026-39858","GHSA-5m6w-wvh7-57vm"],"modified":"2026-06-25T18:45:26.695617307Z","published":"2026-06-25T18:26:48Z","database_specific":{"review_status":"UNREVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-5149"},"references":[{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39858"},{"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"}],"affected":[{"package":{"name":"github.com/traefik/traefik","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-5149.json"}},{"package":{"name":"github.com/traefik/traefik/v2","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.43"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-5149.json"}},{"package":{"name":"github.com/traefik/traefik/v3","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik/v3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.0.0-beta1"},{"fixed":"3.6.14"},{"introduced":"3.7.0-ea.1"},{"fixed":"3.7.0-rc.2"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-5149.json"}}],"schema_version":"1.7.5"}