Caddy: vars_regexp double-expands user input, leaking env vars and files
概要
Caddy: vars_regexp double-expands user input, leaking env vars and files
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
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.
出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Ubuntu UBUNTU-CVE-2026-30852 caddy
参照URL
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com
- web github.com