CVE-2026-109088

libXtst RECORD EnableContext Reply Endless Loop

CVE-2026-109088 is fixed in libxtst on 1 platform by DEBIAN-CVE-2026-109088 (version 2:1.2.6-1), released November 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0027

19th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libxtst · Debian 14	2:1.2.6-1	DEBIAN-CVE-2026-109088	Nov 1, 2026

Details

Published
October 27, 2026
Weakness
Loop with Unreachable Exit Condition ('Infinite Loop')
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109088

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