ALPINE-CVE-2026-30852
- Source
- https://security.alpinelinux.org/vuln/CVE-2026-30852
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-30852.json
- JSON Data
- https://api.osv.dev/v1/vulns/ALPINE-CVE-2026-30852
- Upstream
- Published
- 2026-03-07T17:15:52Z
- Modified
- 2026-11-03T06:30:16Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
- Summary
- [none]
- 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.
- References
Affected packages
Alpine:v3.23 / caddy
Package
- Name
- caddy
- Purl
- pkg:apk/alpine/caddy?arch=source