CVE-2026-109093

X.Org Server XTestFakeInput Valuator Stack Out-Of-Bounds Write

High 8.5

Description

A stack buffer overflow in ProcXTestFakeInput DeviceValuator handling in X.Org xwayland before 24.1.15 and X server before 21.1.26 could be used by authenticated clients to crash or execute code in the X server.

Key facts

Published: 13 Nov 2026
Last changed: 13 Nov 2026
Assigned by: suse
EPSS: 0.163% likely to be exploited in the next 30 days, higher than 5.526% of CVEs (scores for 15 Nov 2026)

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

8.5CVSS 4.0, Highfrom the CNA (suse)CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

CAPEC-100 Overflow Buffers (CNA impact statement)

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
X.Org	xwayland	Default status: unaffected 0 up to but excluding 24.1.15 (affected)
X.Org	xorg-x11-server	Default status: unaffected 0 up to but excluding 21.1.26 (affected)

Timeline

13 Nov 2026 Published

Weakness

CWE-121

References

gitlab.freedesktop.orgpatch