CVE-2026-27586

CRITICAL

9.1

Descripcion

Caddy is an extensible server platform that uses TLS by default. Prior to version 2.11.1, two swallowed errors in `ClientAuthentication.provision()` cause mTLS client certificate authentication to silently fail open when a CA certificate file is missing, unreadable, or malformed. The server starts without error but accepts any client certificate signed by any system-trusted CA, completely bypassing the intended private CA trust boundary. Any deployment using `trusted_ca_cert_file` or `trusted_ca_certs_pem_files` for mTLS will silently degrade to accepting any system-trusted client certificate if the CA file becomes unavailable. This can happen due to a typo in the path, file rotation, corruption, or permission changes. The server gives no indication that mTLS is misconfigured. Version 2.11.1 fixes the vulnerability.

Detalles CVE

Puntuacion CVSS v3.19.1

SeveridadCRITICAL

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

Vector de ataqueNETWORK

ComplejidadLOW

Privilegios requeridosNONE

Interaccion usuarioNONE

Publicado2/24/2026

Ultima modificacion2/25/2026

Fuentenvd

Avistamientos honeypot0

Productos afectados

caddyserver:caddy

Debilidades (CWE)

CWE-755

Referencias

https://gist.github.com/moscowchill/9566c79c76c0b64c57f8bd0716f97c48(security-advisories@github.com)

https://github.com/caddyserver/caddy/releases/tag/v2.11.1(security-advisories@github.com)

https://github.com/caddyserver/caddy/security/advisories/GHSA-hffm-g8v7-wrv7(security-advisories@github.com)

Correlaciones IOC

Sin correlaciones registradas

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