CVE-2026-94286: CWE-126 Buffer over-read in x.org libXtst
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.
AI Analysis
Technical Summary
An out-of-bounds read vulnerability (CWE-126) exists in the RECORD reply parser of libXtst prior to version 1.2.6. A malicious X server can exploit this flaw to cause a crash in attached X clients by triggering the buffer over-read condition. The vulnerability has a CVSS 3.1 base score of 7.1, indicating high severity, with network attack vector, low attack complexity, no privileges required, user interaction required, and impact limited to confidentiality low and availability high.
Potential Impact
The vulnerability can be exploited remotely by a malicious X server to cause denial of service by crashing X clients using libXtst before version 1.2.6. There is no indication of information disclosure or code execution impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade libXtst to version 1.2.6 or later where this vulnerability is fixed. Since no vendor advisory or patch links are provided, confirm patch availability from the official x.org or libXtst project sources. Until patched, avoid connecting to untrusted X servers or restrict access to trusted servers only.
CVE-2026-94286: CWE-126 Buffer over-read in x.org libXtst
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 v3.1
Score 7.1high
Affected software
x.org
libXtst
pkg:github/freedesktop/xorg/libxtstRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An out-of-bounds read vulnerability (CWE-126) exists in the RECORD reply parser of libXtst prior to version 1.2.6. A malicious X server can exploit this flaw to cause a crash in attached X clients by triggering the buffer over-read condition. The vulnerability has a CVSS 3.1 base score of 7.1, indicating high severity, with network attack vector, low attack complexity, no privileges required, user interaction required, and impact limited to confidentiality low and availability high.
Potential Impact
The vulnerability can be exploited remotely by a malicious X server to cause denial of service by crashing X clients using libXtst before version 1.2.6. There is no indication of information disclosure or code execution impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade libXtst to version 1.2.6 or later where this vulnerability is fixed. Since no vendor advisory or patch links are provided, confirm patch availability from the official x.org or libXtst project sources. Until patched, avoid connecting to untrusted X servers or restrict access to trusted servers only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-09-21T09:33:25.369Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aba2d57f7a7c5410670be85
Added to database: 09/28/2026, 09:03:19 UTC
Last enriched: 09/28/2026, 09:17:42 UTC
Last updated: 09/29/2026, 01:57:23 UTC
Views: 20
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