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Fencer Vulns
medium 5.1

CVE-2026-94285 json

Out-of-bounds read in libX11's byte-oriented codeset parser

published 2026-09-28 42 d ago modified 2026-09-30 40 d ago also EUVD-2026-88177

cvss
5.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

An out-of-bounds read in libX11's byte-oriented codeset parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.

Patch / fix

  • x.org libX11 1.8.14
  • libx11 Debian 14 2:1.8.14-1

debian advisories DEBIAN-CVE-2026-94285

  • libx11 Ubuntu 22.04 LTS 2:1.7.5-1ubuntu0.4
  • libx11 Ubuntu 24.04 LTS 2:1.8.7-1ubuntu0.1
  • libx11 Ubuntu 26.04 LTS 2:1.8.13-1ubuntu0.1
  • libx11 Ubuntu Pro 14.04 LTS 2:1.6.2-1ubuntu2.1+esm6
  • libx11 Ubuntu Pro 16.04 LTS 2:1.6.3-1ubuntu2.2+esm5
  • libx11 Ubuntu Pro 18.04 LTS 2:1.6.4-3ubuntu0.4+esm3
  • libx11 Ubuntu Pro 20.04 LTS 2:1.6.9-2ubuntu1.6+esm1

ubuntu advisories UBUNTU-CVE-2026-94285

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

  • libX11 hummingbird 1 1.8.13-3.1.hum1
  • libX11-xcb hummingbird 1 1.8.13-3.1.hum1
  • libX11-common hummingbird 1 1.8.13-3.1.hum1

red hat advisories RHSA-2026:79278

  • libX11 Linux Micro 6.1 1.8.7-slfo.1.1_4.1
  • libX11 Linux Micro 6.0 1.8.7-159998.1.1
  • libX11 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.8.10-160000.5.1
  • libX11 SLE Module for Basesystem 15 SP7 1.8.10-150700.4.8.1
  • libX11 SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 1.6.5-150000.3.41.1
  • libX11 SLES for SAP 15 SP6, SLES 15 SP6-LTSS 1.8.7-150600.3.11.1
  • libX11 SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 1.6.2-12.41.1

suse advisories SUSE-SU-2026:24552-1SUSE-SU-2026:24365-1SUSE-SU-2026:24118-1SUSE-SU-2026:24201-1SUSE-SU-2026:4502-1SUSE-SU-2026:4501-1

  • libX11 openSUSE Leap 16.0 1.8.10-160000.5.1
  • libX11 openSUSE Tumbleweed 1.8.13-3.1

opensuse advisories openSUSE-SU-2026:22055-1openSUSE-SU-2026:11894-1

  • libx11 Alpine 3.24 1.8.14-r0

alpine advisories ALPINE-CVE-2026-94285

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

  • libX11 Azure Linux 3.0 1.8.14-1

azure linux advisories AZL-104957

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-2026-94285 updated cvss 5.1

libX11: libX11: Denial of Service via out-of-bounds read in byte-oriented codeset parser

  • Red Hat Enterprise Linux 6 libX11, libX11-common, libX11 1.8.13-1.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libX11, libX11-common, libX11 1.8.13-1.el10 Red Hat Enterprise Linux 8 libX11, libX11-xcb, libX11-common, libX11 1.8.13-1.el10 Red Hat Enterprise Linux 9 libX11, libX11-xcb, libX11-common, libX11 1.8.13-1.el10 Red Hat Enterprise Linux 10 libX11 1.8.13-1.el10
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images libX11 1.8.13-3.1.hum1, libX11-xcb 1.8.13-3.1.hum1, libX11-common 1.8.13-3.1.hum1
    fixed: vendor fix RHSA-2026:79278

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
40 d ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Affected products

  • x.org libX11

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.