{"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-2026-27588"],"ecosystem":"Go","epss":0.00425,"exploited":false,"fixed_versions":["2.11.1"],"ghsa_id":"GHSA-x76f-jf84-rqj8","id":"tcs_01M5KFRS453WNA16B5TTXYPGPK","modified_at":"2026-02-27T19:53:54Z","published_at":"2026-02-24T20:34:01Z","references":["https://osv.dev/vulnerability/GHSA-x76f-jf84-rqj8","https://github.com/caddyserver/caddy/security/advisories/GHSA-x76f-jf84-rqj8","https://nvd.nist.gov/vuln/detail/CVE-2026-27588","https://github.com/caddyserver/caddy/commit/eec32a0bb5a11651c6a7b04ce82dc50610f2b27e","https://github.com/caddyserver/caddy","https://github.com/caddyserver/caddy/releases/tag/v2.11.1","https://pkg.go.dev/vuln/GO-2026-4541"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"GHSA-x76f-jf84-rqj8","url":"https://osv.dev/vulnerability/GHSA-x76f-jf84-rqj8"},{"source":"nvd","source_id":"CVE-2026-27588","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27588"}],"summary":"Caddy: MatchHost becomes case-sensitive for large host lists (>100), enabling host-based route/auth bypass"}