{"id":"ALPINE-CVE-2026-30852","details":"Caddy is an extensible server platform that uses TLS by default. From version 2.7.5 to before version 2.11.2, the vars_regexp matcher in vars.go:337 double-expands user-controlled input through the Caddy replacer. When vars_regexp matches against a placeholder like {http.request.header.X-Input}, the header value gets resolved once (expected), then passed through repl.ReplaceAll() again (the bug). This means an attacker can put {env.DATABASE_URL} or {file./etc/passwd} in a request header and the server will evaluate it, leaking environment variables, file contents, and system info. This issue has been patched in version 2.11.2.","modified":"2026-11-03T06:30:16.832311756Z","published":"2026-03-07T17:15:52.733Z","upstream":["CVE-2026-30852"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2026-30852"}],"affected":[{"package":{"name":"caddy","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/caddy?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.7.5"},{"fixed":"2.11.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-30852.json"}},{"package":{"name":"caddy","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/caddy?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.7.5"},{"fixed":"2.11.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-30852.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}