CVE-2026-119559 OpenLiteSpeed through 1.9.4 mTLS Bypass via HTTP/3 SNI and Host Mismatch

High 8.2 Published 30 Oct 2026 Updated 5 Nov 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-119559?

CVE-2026-119559 is a high-severity vulnerability in litespeedtech openlitespeed, published on 30 Oct 2026.

Official description

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.

Weakness: CWE-295

Which versions are affected by CVE-2026-119559?

How do I fix CVE-2026-119559?

No fix has been published for CVE-2026-119559 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-119559 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-119559 exists.

Sources

Also known as GHSA-75rw-wm76-93p4.