{"schema_version":"1.3.1","id":"GO-2026-5346","modified":"2026-07-24T18:35:55Z","published":"2026-07-24T18:35:55Z","aliases":["CVE-2026-52845","GHSA-f59h-q822-g45g"],"summary":"Caddy: FastCGI header normalization bypass in forward_auth copy_headers in github.com/caddyserver/caddy","details":"Caddy: FastCGI header normalization bypass in forward_auth copy_headers in github.com/caddyserver/caddy","affected":[{"package":{"name":"github.com/caddyserver/caddy/v2","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.4"}]}],"ecosystem_specific":{"imports":[{"path":"github.com/caddyserver/caddy/v2/modules/caddyhttp/reverseproxy/fastcgi","symbols":["Transport.Provision","Transport.RoundTrip","Transport.UnmarshalCaddyfile","client.Do","client.Get","client.Head","client.Options","client.Post","client.PostFile","client.PostForm","client.Request","clientCloser.Close","record.Read","streamReader.Read","streamWriter.Flush","streamWriter.FlushStream","streamWriter.Write"]}]}}],"references":[{"type":"ADVISORY","url":"https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g"},{"type":"FIX","url":"https://github.com/caddyserver/caddy/pull/7633"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-5346","review_status":"REVIEWED"}}