{"action":"Upgrade github.com/caddyserver/caddy/v2 to 2.11.4 or later.","affected":[{"fixed":"2.11.4","introduced":"0"}],"component":"github.com/caddyserver/caddy/v2","cve_ids":["CVE-2026-52845"],"ecosystem":"Go","epss":0.00445,"exploited":false,"fixed_versions":["2.11.4"],"ghsa_id":"GHSA-f59h-q822-g45g","id":"tcs_01M5KF8CHXTJMZBMHCVD8Z5ADD","modified_at":"2026-07-24T19:11:38.174856198Z","published_at":"2026-06-16T21:28:28Z","references":["https://osv.dev/vulnerability/GHSA-f59h-q822-g45g","https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g","https://nvd.nist.gov/vuln/detail/CVE-2026-52845","https://access.redhat.com/security/cve/CVE-2026-52845","https://bugzilla.redhat.com/show_bug.cgi?id=2491907","https://github.com/caddyserver/caddy","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52845.json"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GHSA-f59h-q822-g45g","url":"https://osv.dev/vulnerability/GHSA-f59h-q822-g45g"}],"summary":"Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`"}