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TI-2026-63393 Aliases CVE-2026-94286GHSA-xhgq-6j5j-j427

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

Priority LOW 31CWE-126Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · None · High
Fix status
Partial Red Hat: 14 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00202 10th percentileScored 2026-11-07
Fix Partial libXtst (x.org): 1.2.6Red Hat: 11 advisoriesRed Hat: 14 fixed, 2 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.orglibXtstbefore 1.2.61.2.6Patch availableCNA
  • libXtst Vendorx.org Affected before 1.2.6 Fixed in 1.2.6 Patch available CNA

Remediation

  • Fix · CNA libXtst (x.org) Fixed in 1.2.6

Red Hat 11 advisories

  • RHSA-2026:94567 Released 2026-11-03 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream E4S (v.8.8) libXtst-1.2.3-7.el8_8.1, libXtst-devel-1.2.3-7.el8_8.1
    • Red Hat Enterprise Linux AppStream TUS (v.8.8) libXtst-1.2.3-7.el8_8.1, libXtst-devel-1.2.3-7.el8_8.1
  • RHSA-2026:94482 Released 2026-11-03 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.4) libXtst-1.2.3-7.el8_4.1, libXtst-devel-1.2.3-7.el8_4.1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) libXtst-1.2.3-7.el8_4.1, libXtst-devel-1.2.3-7.el8_4.1
  • RHSA-2026:94449 Released 2026-11-03 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream AUS (v.8.6) libXtst-1.2.3-7.el8_6.1, libXtst-devel-1.2.3-7.el8_6.1
    • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) libXtst-1.2.3-7.el8_6.1, libXtst-devel-1.2.3-7.el8_6.1
Show 8 more Red Hat advisories
  • RHSA-2026:93451 Released 2026-11-02 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.4) libXtst-1.2.3-16.el9_4.1, libXtst-devel-1.2.3-16.el9_4.1
  • RHSA-2026:93450 Released 2026-11-02 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.6) libXtst-1.2.3-16.el9_6.1, libXtst-devel-1.2.3-16.el9_6.1
  • RHSA-2026:93449 Released 2026-11-02 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream E4S (v.9.2) libXtst-1.2.3-16.el9_2.1, libXtst-devel-1.2.3-16.el9_2.1
  • RHSA-2026:93448 Released 2026-11-02 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream EUS (v. 10.0) libXtst-1.2.4-8.el10_0.1, libXtst-devel-1.2.4-8.el10_0.1
  • RHSA-2026:91223 Released 2026-10-29 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream (v. 9) libXtst-1.2.3-16.el9_8.1, libXtst-devel-1.2.3-16.el9_8.1
  • RHSA-2026:91612 Released 2026-10-28 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream (v. 10) libXtst-1.2.4-8.el10_2.1, libXtst-devel-1.2.4-8.el10_2.1
  • RHSA-2026:91294 Released 2026-10-27 · Red Hat rating Important
    libXtst security update
    • Red Hat Enterprise Linux AppStream (v. 8) libXtst-1.2.3-8.el8_10, libXtst-devel-1.2.3-8.el8_10
  • RHSA-2026:79192 Released 2026-10-08 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images libXtst-1.2.5-5.1.hum1@aarch64, libXtst-1.2.5-5.1.hum1@src, libXtst-1.2.5-5.1.hum1@x86_64 +2

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:91612
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:91294
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:91223
Red Hat Enterprise Linux AppStream AUS (v.8.4)Fixed RHSA-2026:94482
Red Hat Enterprise Linux AppStream AUS (v.8.6)Fixed RHSA-2026:94449
Red Hat Enterprise Linux AppStream E4S (v.8.8)Fixed RHSA-2026:94567
Red Hat Enterprise Linux AppStream E4S (v.9.2)Fixed RHSA-2026:93449
Red Hat Enterprise Linux AppStream E4S (v.9.4)Fixed RHSA-2026:93451
Red Hat Enterprise Linux AppStream EUS (v. 10.0)Fixed RHSA-2026:93448
Red Hat Enterprise Linux AppStream EUS (v.9.6)Fixed RHSA-2026:93450
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)Fixed RHSA-2026:94482
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6)Fixed RHSA-2026:94449
Red Hat Enterprise Linux AppStream TUS (v.8.8)Fixed RHSA-2026:94567
Red Hat Hardened ImagesFixed RHSA-2026:79192

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-94286
  2. 2026-10-03 Alias added: GHSA-xhgq-6j5j-j427
  3. 2026-10-09 Fix available: RHSA-2026:79192 · Red Hat
  4. 2026-10-09 Fix available: Red Hat Hardened Images · Red Hat
  5. 2026-10-29 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 8) · Red Hat
  6. 2026-10-29 Fix available: RHSA-2026:91612 · Red Hat
  7. 2026-10-29 Fix available: RHSA-2026:91294 · Red Hat
  8. 2026-10-30 Fix available: Red Hat Enterprise Linux AppStream (v. 9) · Red Hat
  9. 2026-10-30 Fix available: RHSA-2026:91223 · Red Hat
  10. 2026-11-02 Fix available: RHSA-2026:93448 · Red Hat
  11. 2026-11-02 Fix available: RHSA-2026:93450 · Red Hat
  12. 2026-11-02 Fix available: RHSA-2026:93451 · Red Hat
  13. 2026-11-02 Fix available: RHSA-2026:93449 · Red Hat
  14. 2026-11-02 Fix available: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux AppStream EUS (v. 10.0) +1 · Red Hat
  15. 2026-11-03 Fix available: RHSA-2026:94449 · Red Hat
  16. 2026-11-03 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · Red Hat
  17. 2026-11-03 Fix available: RHSA-2026:94482 · Red Hat
  18. 2026-11-03 Fix available: RHSA-2026:94567 · Red Hat
  19. 2026-11-03 Fix available: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) +1 · 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