Caddy's mTLS client authentication silently fails open when CA certificate file is missing or malformed
概要
Caddy's mTLS client authentication silently fails open when CA certificate file is missing or malformed
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. 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.
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
- Debian DEBIAN-CVE-2026-27586 caddy
- Ubuntu UBUNTU-CVE-2026-27586 caddy
参照URL
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- web gist.github.com
- web github.com