{"schema_version":"1.7.3","id":"GO-2026-4539","published":"2026-02-26T16:27:51Z","modified":"2026-02-26T19:11:17.562639Z","aliases":["CVE-2026-27586","GHSA-hffm-g8v7-wrv7"],"summary":"Caddy mTLS authentication fails open in github.com/caddyserver/caddy/v2","details":"Caddy mTLS authentication fails open in github.com/caddyserver/caddy/v2","affected":[{"package":{"name":"github.com/caddyserver/caddy/v2","ecosystem":"Go","purl":"pkg:golang/github.com/caddyserver/caddy/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.1"}]}],"ecosystem_specific":{"imports":[{"path":"github.com/caddyserver/caddy/v2/modules/caddytls","symbols":["ClientAuthentication.ConfigureTLSConfig","ConnectionPolicies.Provision"]}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-4539.json"}}],"references":[{"type":"ADVISORY","url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-hffm-g8v7-wrv7"},{"type":"FIX","url":"https://github.com/caddyserver/caddy/commit/d42d39b4bc237c628f9a95363b28044cb7a7fe72"},{"type":"WEB","url":"https://gist.github.com/moscowchill/9566c79c76c0b64c57f8bd0716f97c48"},{"type":"WEB","url":"https://github.com/caddyserver/caddy/releases/tag/v2.11.1"}],"database_specific":{"review_status":"REVIEWED","url":"https://pkg.go.dev/vuln/GO-2026-4539"}}