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TI-2026-63023 Aliases CVE-2026-93543GHSA-r63g-v8rx-c2hg

Out-of-bounds read in libXi's XI2 class parser

Priority LOW 32CWE-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: 4 fixed, 2 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 in libXi's XI2 class parser in libXi before 1.8.4 could be used by malicious X servers to crash an attached X client.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00262 18th percentileScored 2026-11-07
Fix Partial libXi (x.org): 1.8.4Red Hat: 4 advisoriesRed Hat: 4 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.orglibXibefore 1.8.41.8.4Patch availableCNA
  • libXi Vendorx.org Affected before 1.8.4 Fixed in 1.8.4 Patch available CNA

Remediation

  • Fix · CNA libXi (x.org) Fixed in 1.8.4

Red Hat 4 advisories

  • RHSA-2026:91056 Released 2026-10-29 · Red Hat rating Moderate
    libXi security update
    • Red Hat Enterprise Linux AppStream (v. 9) libXi-1.7.10-8.el9_8.1, libXi-devel-1.7.10-8.el9_8.1
  • RHSA-2026:91268 Released 2026-10-27 · Red Hat rating Moderate
    libXi security update
    • Red Hat Enterprise Linux AppStream (v. 8) libXi-1.7.10-2.el8_10, libXi-devel-1.7.10-2.el8_10
  • RHSA-2026:91004 Released 2026-10-27 · Red Hat rating Moderate
    libXi security update
    • Red Hat Enterprise Linux AppStream (v. 10) libXi-1.8.1-7.el10_2.1, libXi-devel-1.8.1-7.el10_2.1
Show 1 more Red Hat advisories
  • RHSA-2026:71839 Released 2026-09-25 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images libXi-1.8.3-2.1.hum1@aarch64, libXi-1.8.3-2.1.hum1@src, libXi-1.8.3-2.1.hum1@x86_64 +2

Fixed in the same release

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

  • Release ·

    x.org libXi 1.8.4

    6 records Highest priority Priority LOW 6 LOW

    Other records, highest priority first

    • TI-2026-63388 Out-of-bounds read in libXi's XListInputDevices() class parsingPriority LOW 28
    • TI-2026-63025 Out-of-bounds read in libXi's XListInputDevices()Priority LOW 28
    • TI-2026-63024 Out-of-bounds read in libXi's XI2 XIQueryDevice reply parsingPriority LOW 28
    Show all 6 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. 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-2026:91004
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2026:91268
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:91056
Red Hat Hardened ImagesFixed RHSA-2026:71839

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93543
  2. 2026-10-03 Alias added: GHSA-r63g-v8rx-c2hg
  3. 2026-10-29 Fix available: RHSA-2026:91004 · Red Hat
  4. 2026-10-29 Fix available: RHSA-2026:91268 · Red Hat
  5. 2026-10-30 Fix available: RHSA-2026:91056 · Red Hat
  6. 2026-10-30 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux AppStream (v. 9) · 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