Red Hat Security Advisory

RHSA-2026:91223

libXtst security update

Released 2026-10-29 · Red Hat rating Important · View on Red Hat →

Fixed in

Red Hat Enterprise Linux AppStream (v. 9) libXtst-1.2.3-16.el9_8.1, libXtst-devel-1.2.3-16.el9_8.1

TI-2026-63393 CVE-2026-94286 · GHSA-xhgq-6j5j-j427

LOW 31

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.

CVSS 3.1HIGH 7.1 Network No auth User interaction EPSS 0.00202 Published 2026-09-28 Partial fix · 1.2.6 CWE-126