{"action":"Upgrade github.com/traefik/traefik/v3 to 3.6.22 or later.","affected":[{"fixed":"3.6.22","introduced":"0"},{"fixed":"3.7.6","introduced":"3.7.0"}],"component":"github.com/traefik/traefik/v3","cve_ids":["CVE-2026-54763"],"ecosystem":"Go","epss":0.00239,"exploited":false,"fixed_versions":["3.6.22","3.7.6"],"ghsa_id":"GHSA-x677-9fxg-v5c5","id":"tcs_01M5KFRNP5E4X0G2W9Z1TFTXQR","modified_at":"2026-08-18T15:11:00.208827242Z","published_at":"2026-08-06T16:53:53Z","references":["https://osv.dev/vulnerability/GHSA-x677-9fxg-v5c5","https://github.com/traefik/traefik/security/advisories/GHSA-x677-9fxg-v5c5","https://nvd.nist.gov/vuln/detail/CVE-2026-54763","https://github.com/traefik/traefik/pull/13262","https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b","https://github.com/traefik/traefik","https://github.com/traefik/traefik/releases/tag/v2.11.51","https://github.com/traefik/traefik/releases/tag/v3.6.22","https://github.com/traefik/traefik/releases/tag/v3.7.6"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"GHSA-x677-9fxg-v5c5#Go/github.com/traefik/traefik/v3","url":"https://osv.dev/vulnerability/GHSA-x677-9fxg-v5c5"},{"source":"nvd","source_id":"CVE-2026-54763","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54763"}],"summary":"Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth"}