CVE-2026-119559 Details
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.
An authentication bypass vulnerability has been identified in OpenLiteSpeed versions through 1.9.4. This vulnerability allows unauthenticated remote attackers to evade virtual host client certificate requirements over HTTP/3. The issue arises because the QuicStream component inherits a verifyContext() implementation that always returns true. Attackers can exploit this by presenting a non-mTLS host's SNI along with a protected Host header to access restricted content.
Users can turn off HTTP/3 on listeners that share names with a vhost requiring client certificates. Alternatively, avoid sharing those names.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 30, 2026CISA-ADP
Assessed Nov 5, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-295 | Improper Certificate Validation | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| OpenLiteSpeed | <= 1.9.4 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 5, 2026 | CVE Modified | CISA-ADP |
| Oct 30, 2026 | New CVE Received | [email protected] |