What’s Vulnerable › Vulnerabilities

CVE-2026-94286: Out-of-bounds read in libXtst's RECORD reply parser

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-30
• Weakness: CWE-126

Description

An out-of-bounds read in libXtst's RECORD reply parser in libXtst before 1.2.6 could be used by malicious X servers to crash attached X clients.

Affected products

• x.org libXtst: before 1.2.6 — fixed in 1.2.6

How to fix

Upgrade to a fixed version: x.org libXtst 1.2.6. Check the vendor advisory for mitigations.

References

• https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/10/diffs?commit_id=16023c86070e6af9407330deea3938fcef75815b

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