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Fencer Vulns
high 7.1

CVE-2026-94286 json

Out-of-bounds read in libXtst's RECORD reply parser

published 2026-09-28 42 d ago modified 2026-09-30 39 d ago also EUVD-2026-88178

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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.

Patch / fix

  • x.org libXtst 1.2.6
  • libxtst Debian 14 2:1.2.6-1

debian advisories DEBIAN-CVE-2026-94286

  • libxtst Ubuntu 22.04 LTS 2:1.2.3-1ubuntu0.22.04.1
  • libxtst Ubuntu 24.04 LTS 2:1.2.3-1.1ubuntu0.1
  • libxtst Ubuntu 26.10 2:1.2.5-1ubuntu1
  • libxtst Ubuntu 26.04 LTS 2:1.2.5-1ubuntu0.1
  • libxtst Ubuntu Pro 16.04 LTS 2:1.2.2-1ubuntu0.1~esm1
  • libxtst Ubuntu Pro 18.04 LTS 2:1.2.3-1ubuntu0.18.04.1~esm1
  • libxtst Ubuntu Pro 20.04 LTS 2:1.2.3-1ubuntu0.20.04.1~esm1

ubuntu advisories UBUNTU-CVE-2026-94286

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libXtst hummingbird 1 1.2.5-5.1.hum1

red hat advisories RHSA-2026:79192

  • libXtst SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 1.2.3-150000.3.3.1
  • libXtst SLES for SAP applications 16.0, SLES 16.0 1.2.5-160000.4.1
  • libXtst SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.2.2-8.3.1

suse advisories SUSE-SU-2026:4566-1SUSE-SU-2026:4565-1SUSE-SU-2026:24145-1

  • libXtst openSUSE Leap 16.0 1.2.5-160000.4.1
  • libXtst openSUSE Tumbleweed 1.2.5-2.1

opensuse advisories openSUSE-SU-2026:22031-1openSUSE-SU-2026:11897-1

  • libXtst AlmaLinux 10 1.2.4-8.el10_2.1
  • libXtst AlmaLinux 9 1.2.3-16.el9_8.1
  • libXtst AlmaLinux 8 1.2.3-8.el8_10

almalinux advisories ALSA-2026:91612ALSA-2026:91223ALSA-2026:91294

  • libXtst Rocky Linux 9 1.2.3-16.el9_8.1
  • libXtst Rocky Linux 10 1.2.4-8.el10_2.1
  • libXtst Rocky Linux 8 1.2.3-8.el8_10

rocky linux advisories RLSA-2026:91223RLSA-2026:91612RLSA-2026:91294

  • libxtst Alpine 3.24 1.2.6-r0

alpine advisories ALPINE-CVE-2026-94286

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libXtst Azure Linux 3.0 1.2.6-1

azure linux advisories AZL-104969

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-94286 updated cvss 7.1

libXtst: libXtst: Denial of Service via out-of-bounds read in RECORD reply parser

  • Red Hat Enterprise Linux 6 libXtst
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libXtst
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) libXtst 1.2.3-8.el8_10
    fixed: vendor fix RHSA-2026:91294
  • Red Hat Enterprise Linux AppStream (v. 9) libXtst 1.2.3-16.el9_8.1
    fixed: vendor fix RHSA-2026:91223
  • Red Hat Enterprise Linux AppStream (v. 10) libXtst 1.2.4-8.el10_2.1
    fixed: vendor fix RHSA-2026:91612
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) libXtst 1.2.3-7.el8_4.1
    fixed: vendor fix RHSA-2026:94482
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) libXtst 1.2.3-7.el8_6.1
    fixed: vendor fix RHSA-2026:94449
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) libXtst 1.2.3-7.el8_8.1
    fixed: vendor fix RHSA-2026:94567
show 8 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) libXtst 1.2.3-16.el9_2.1
    fixed: vendor fix RHSA-2026:93449
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) libXtst 1.2.3-16.el9_4.1
    fixed: vendor fix RHSA-2026:93451
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libXtst 1.2.4-8.el10_0.1
    fixed: vendor fix RHSA-2026:93448
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) libXtst 1.2.3-16.el9_6.1
    fixed: vendor fix RHSA-2026:93450
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libXtst 1.2.3-7.el8_4.1
    fixed: vendor fix RHSA-2026:94482
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libXtst 1.2.3-7.el8_6.1
    fixed: vendor fix RHSA-2026:94449
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) libXtst 1.2.3-7.el8_8.1
    fixed: vendor fix RHSA-2026:94567
  • Red Hat Hardened Images libXtst 1.2.5-5.1.hum1
    fixed: vendor fix RHSA-2026:79192

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
39 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Affected products

  • x.org libXtst

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.