CVE-2026-27586

CRITICAL9.1EPSS 0.13%

Caddy mTLS authentication fails open in github.com/caddyserver/caddy/v2

發布日:2026/2/24修改日:2026/4/30

也稱為:DEBIAN-CVE-2026-27586

描述

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.

受影響套件(3)

Debian/caddyfrom 0
Go/github.com/caddyserver/caddy/v2from 0, < 2.11.1
Go/github.com/caddyserver/caddy/v2from 0, < 2.11.1

CVSS 分數

來源	版本	嚴重程度	向量
osv	CVSS 4.0	—	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
osv	CVSS 3.1	CRITICAL9.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

描述

受影響套件(3)

CVSS 分數

參考連結(8)