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TI-2026-63390 Aliases CVE-2026-94283GHSA-j5qx-6vm4-vfcj

Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser

Priority LOW 28CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 1 fixed, 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

An out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parser in libX11 before 1.8.14 could be used by malicious X servers to crash attached X clients.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00213 11th percentileScored 2026-11-07
Fix Partial libX11 (x.org): 1.8.14Red Hat: 1 advisoryRed Hat: 1 fixed, 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
x.orglibX11before 1.8.141.8.14Patch availableCNA
  • libX11 Vendorx.org Affected before 1.8.14 Fixed in 1.8.14 Patch available CNA

Remediation

  • Fix · CNA libX11 (x.org) Fixed in 1.8.14

Red Hat 1 advisory

  • RHSA-2026:79278 Released 2026-10-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images libX11-1.8.13-3.1.hum1@aarch64, libX11-1.8.13-3.1.hum1@src, libX11-1.8.13-3.1.hum1@x86_64 +7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    x.org libX11 1.8.14

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-63391 Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parserPriority LOW 24
    • TI-2026-63392 Out-of-bounds read in libX11's byte-oriented codeset parserPriority LOW 22
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:79278

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-94283
  2. 2026-10-03 Alias added: GHSA-j5qx-6vm4-vfcj
  3. 2026-10-09 Fix available: RHSA-2026:79278 · Red Hat
  4. 2026-10-09 Fix available: Red Hat Hardened Images · Red Hat

References

Patch 1

  • TI-2022-25238 In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for… CVSS 3.1HIGH 7.7
  • TI-1999-00519 An X server's access control is disabled (e.g. CVSS 2.0HIGH 10.0
  • TI-2021-11657 LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote… CVSS 3.1CRITICAL 9.8
  • TI-2018-10465 An issue was discovered in libX11 through 1.6.5. CVSS 3.0CRITICAL 9.8
  • TI-2004-00826 Multiple vulnerabilities in libXpm for 6.8.1 and earlier, as used in XFree86 and other… CVSS 2.0HIGH 10.0
  • TI-2016-08240 Multiple integer overflows in libXpm before 3.5.12, when a program requests parsing XPM… CVSS 3.0CRITICAL 9.8
See all 206 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences