CVE-2026-30852— Caddy 信息泄露漏洞

Caddy: vars_regexp double-expands user input, leaking env vars and files

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.

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信息暴露

Caddy 信息泄露漏洞

Caddy是Caddy公司的一款开源、跨平台的HTTP/Web服务器。 Caddy 2.7.5版本至2.11.2之前版本存在信息泄露漏洞，该漏洞源于vars_regexp匹配器对用户输入进行双重扩展，可能导致环境变量和文件内容泄露。

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