{"action":"Upgrade github.com/caddyserver/caddy/v2 to 2.11.1 or later.","affected":[{"fixed":"2.11.1","introduced":"0"}],"component":"github.com/caddyserver/caddy/v2","cve_ids":["CVE-2026-27586"],"ecosystem":"Go","epss":0.00295,"exploited":false,"fixed_versions":["2.11.1"],"ghsa_id":"GHSA-hffm-g8v7-wrv7","id":"tcs_01M5KGEDKBB101JJGCDW55KCAA","modified_at":"2026-02-26T19:11:17.562639Z","published_at":"2026-02-26T16:27:51Z","references":["https://osv.dev/vulnerability/GO-2026-4539","https://github.com/caddyserver/caddy/security/advisories/GHSA-hffm-g8v7-wrv7","https://github.com/caddyserver/caddy/commit/d42d39b4bc237c628f9a95363b28044cb7a7fe72","https://gist.github.com/moscowchill/9566c79c76c0b64c57f8bd0716f97c48","https://github.com/caddyserver/caddy/releases/tag/v2.11.1"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"GO-2026-4539","url":"https://osv.dev/vulnerability/GO-2026-4539"},{"source":"nvd","source_id":"CVE-2026-27586","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27586"}],"summary":"Caddy mTLS authentication fails open in github.com/caddyserver/caddy/v2"}