Unchecked Return Value

Overview Affected versions of this package are vulnerable to Unchecked Return Value due to improper error handling in the provision function. An attacker can gain unauthorized access by presenting a client certificate signed by any system-trusted certificate authority, bypassing the intended...

CVE-2026-27586

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...

CVE-2026-27586 Caddy's mTLS client authentication silently fails open when CA certificate file is missing or malformed

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...