CVE-2026-94286 Out-of-bounds read in libXtst's RECORD reply parser
High 7.1
Published
Updated
Check this codebase for CVE-2026-94286 and fix it if it is affected.
What it is: CVE-2026-94286 is a high-severity memory corruption vulnerability in x.org libXtst, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-94286 in the wild and no public exploit code.
Affected product: x.org libXtst. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-94286/ (Markdown: https://insights.sbomify.com/CVE-2026-94286/index.md)
A malicious X server can crash X clients via an out-of-bounds read in libXtst's RECORD reply parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-94286?
CVE-2026-94286 is a high-severity memory corruption vulnerability in x.org libXtst, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-126
Which versions are affected by CVE-2026-94286?
Linux distribution packages (30)
libXtst AlmaLinux:10 | All versions | 1.2.4-8.el10_2.1 |
libXtst-devel AlmaLinux:10 | All versions | 1.2.4-8.el10_2.1 |
libXtst AlmaLinux:8 | All versions | 1.2.3-8.el8_10 |
libXtst-devel AlmaLinux:8 | All versions | 1.2.3-8.el8_10 |
libXtst AlmaLinux:9 | All versions | 1.2.3-16.el9_8.1 |
libXtst-devel AlmaLinux:9 | All versions | 1.2.3-16.el9_8.1 |
libXtst Red Hat:hummingbird:1 | All versions | 0:1.2.5-5.1.hum1 |
libXtst-devel Red Hat:hummingbird:1 | All versions | 0:1.2.5-5.1.hum1 |
libXtst Rocky Linux:10 | All versions | 0:1.2.4-8.el10_2.1 |
libXtst Rocky Linux:8 | All versions | 0:1.2.3-8.el8_10 |
libXtst SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Micro 5.3 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Micro 5.4 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Micro 5.5 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 1.2.2-8.3.1 |
libXtst SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server 16.0 | All versions | 1.2.5-160000.4.1 |
libXtst SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 1.2.2-8.3.1 |
libXtst SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 1.2.3-150000.3.3.1 |
libXtst SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 1.2.5-160000.4.1 |
libXtst openSUSE:Leap 16.0 | All versions | 1.2.5-160000.4.1 |
libXtst openSUSE:Tumbleweed | All versions | 1.2.5-2.1 |
How do I fix CVE-2026-94286?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-94286 being exploited?
There is no known exploitation of CVE-2026-94286 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-94286, ALSA-2026:91223, ALSA-2026:91294, ALSA-2026:91612, AZL-104969, BELL-CVE-2026-94286 and 19 more.