CVE-2026-94286 libXtst - Denial of Service

libXtst before 1.2.6 contains an out-of-bounds read caused by improper handling in the RECORD reply parser, letting malicious X servers crash attached X clients, exploit requires malicious X server.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Published
28 September 2026
Updated
15 October 2026
Weakness
CWE-126

Vendor fix

Update to version 1.2.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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