6.5 Medium

CVE-2026-109088 libXtst RECORD EnableContext Reply Endless Loop

Description

A malicious X server could send malformed RECORD EnableContext reolies that can cause a X client using the parse_reply_call_callback function in libXtst before 1.2.6 to enter a endless loop.

CVSS 3.1 detail

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploitable remotely over the network, without an account and if a user takes an action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Privileges required: None
Interaction: Required
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
libXtst 1.2	earliest → < 1.2.6	1.2.6

References

gitlab.freedesktop.org gitlab.freedesktop.org

Timeline

Published October 27, 2026
Last modified November 4, 2026

The 2 CVEs of libXtst →

CVE-2026-94286 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… 7.1 High

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