{"action":"Upgrade github.com/traefik/traefik/v2 to 2.11.43 or later.","affected":[{"fixed":"2.11.43","introduced":"0"}],"component":"github.com/traefik/traefik/v2","cve_ids":["CVE-2026-39858"],"ecosystem":"Go","epss":0.00605,"exploited":false,"fixed_versions":["2.11.43"],"ghsa_id":"GHSA-5m6w-wvh7-57vm","id":"tcs_01M5KEYG397WBJEPN0PD4HRWNP","modified_at":"2026-06-25T18:56:35.695416554Z","published_at":"2026-04-24T16:32:34Z","references":["https://osv.dev/vulnerability/GHSA-5m6w-wvh7-57vm","https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm","https://nvd.nist.gov/vuln/detail/CVE-2026-39858","https://github.com/traefik/traefik","https://github.com/traefik/traefik/releases/tag/v2.11.43","https://github.com/traefik/traefik/releases/tag/v3.6.14","https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2"],"severity":{"label":"critical","score":10},"sources":[{"source":"osv","source_id":"GHSA-5m6w-wvh7-57vm#Go/github.com/traefik/traefik/v2","url":"https://osv.dev/vulnerability/GHSA-5m6w-wvh7-57vm"}],"summary":"Traefik: Pre-authentication decision bypass due to forwarded alias spoofing"}