CVE-2026-30852

HIGH

7.5

Description

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.

Details CVE

Score CVSS v3.17.5

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie3/7/2026

Derniere modification3/11/2026

Sourcenvd

Observations honeypot0

Produits affectes

caddyserver:caddy

Faiblesses (CWE)

CWE-74CWE-200

References

https://github.com/caddyserver/caddy/pull/5408(security-advisories@github.com)

https://github.com/caddyserver/caddy/releases/tag/v2.11.2(security-advisories@github.com)

https://github.com/caddyserver/caddy/security/advisories/GHSA-m2w3-8f23-hxxf(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

This product uses data from the NVD API but is not endorsed or certified by the NVD.