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libXtst CVE-2026-94286

| EUVDEUVD-2026-88178 HIGH
Buffer Over-read (CWE-126)
2026-09-28 suse GHSA-xhgq-6j5j-j427
Buffer Overflow Red Hat Suse X Org Libxtst
7.1
CVSS 3.1 · Vendor: suse
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Severity by source

Vendor (suse) PRIMARY
7.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
vuln.today AI
5.4 MEDIUM

Malicious server crashes one attached client (DoS of a single process → A:L not A:H), with minor over-read exposure C:L; victim must connect to hostile server (UI:R).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.1 HIGH
qualitative

Primary rating from Vendor (suse).

CVSS VectorVendor: suse

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Sep 28, 2026 - 09:18 vuln.today
CVE Published
Sep 28, 2026 - 08:50 cve.org
HIGH 7.1

DescriptionCVE.org

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.

AnalysisAI

An out-of-bounds read in libXtst's RECORD reply parser (CWE-126) allows a malicious or compromised X server to crash attached X clients that link the library and use the XTEST/RECORD extension, affecting all versions before 1.2.6. The assessed vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L, meaning unauthenticated attackers in the network position of the rogue server can trigger a low-integrity information leak and a denial of service, but only if the victim voluntarily connects to that server (UI:R). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim X client to link libXtst and use the XTEST/RECORD extension, and to connect to an attacker-controlled or compromised X server (e.g., a hostile remote X display, malicious display manager, or X11-forwarding to an untrusted host). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but low-priority issue that requires careful reading of its unusual (reverse-trust) threat model. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade libXtst to version 1.2.6 or later; this is the vendor-released fix for the affected range and is the recommended action for any system that ships the library, with distribution packages expected to backport the equivalent change. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory every Linux/Unix system, container image, and third-party application that links libXtst and confirm the installed version, flagging anything below 1.2.6; where a vulnerable version is found, restrict outbound X connections to approved, trusted servers and advise users not to connect X clients to unvetted remote display hosts. …

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Same weakness CWE-126 – Buffer Over-read

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
Container suse/kiosk/tigervnc-x11vnc:latest Affected
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed

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CVE-2026-94286 vulnerability details – vuln.today
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