CVE-2026-119559

22th percentile - higher than 22% of all known CVEs

OpenLiteSpeed through 1.9.4 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to evade virtual host client certificate requirements over HTTP/3. Because QuicStream inherits a verifyContext() implementation that always returns true, attackers can present a non-mTLS host's SNI with a protected Host header to access protected content.

Attackers can access resources protected by client certificates without valid authentication, potentially leading to unauthorized data access and confidentiality breaches.

Update OpenLiteSpeed to a version later than 1.9.4 or apply the vendor patch. Until then, consider disabling HTTP/3 or tightening network-level access controls.