{"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-2026-27590"],"ecosystem":"Go","epss":0.00614,"exploited":false,"fixed_versions":["2.11.1"],"ghsa_id":"GHSA-5r3v-vc8m-m96g","id":"tcs_01M5KEYQS84C9BXC00YVA8D5KN","modified_at":"2026-02-27T19:55:10Z","published_at":"2026-02-24T20:39:08Z","references":["https://osv.dev/vulnerability/GHSA-5r3v-vc8m-m96g","https://github.com/caddyserver/caddy/security/advisories/GHSA-5r3v-vc8m-m96g","https://github.com/php/frankenphp/security/advisories/GHSA-g966-83w7-6w38","https://nvd.nist.gov/vuln/detail/CVE-2026-27590","https://github.com/caddyserver/caddy","https://github.com/caddyserver/caddy/releases/tag/v2.11.1","https://pkg.go.dev/vuln/GO-2026-4536"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GHSA-5r3v-vc8m-m96g","url":"https://osv.dev/vulnerability/GHSA-5r3v-vc8m-m96g"},{"source":"nvd","source_id":"CVE-2026-27590","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27590"}],"summary":"Caddy: Unicode case-folding length expansion causes incorrect split_path index in FastCGI transport"}