Web Application Vulnerabilities Runtime SCA Findings
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Caddy Web Server Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection) Vulnerability - CVE-2026-30852 - Vulnerability Database
Caddy Web Server

Caddy Web Server Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection) Vulnerability - CVE-2026-30852

High
Reference: CVE-2026-30852
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2026-30852
Title: Caddy Web Server Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection) Vulnerability
Overview:

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.