CVE-2026-30852
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.
- Affected products
- Caddy
- Caddyserver Caddy
- < 2.11.2
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.4% (33th percentile)
- Weakness
- CWE-74, CWE-200
- NVD status
- Analyzed
- Published
- 2026-03-07
No indexed exploits for CVE-2026-30852 yet
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No exploit for CVE-2026-30852 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.