High severity · published Sep 28, 2026
CVE-2026-94286
Out-of-bounds read in libXtst's RECORD reply parser
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libXtst · x.org
before 1.2.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-94286
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-94286
patch
https://gitlab.freedesktop.org/xorg/lib/libxtst/-/merge_requests/10/diffs?commit_id=16023c86070e6af9407330deea3938fcef75815b
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