Read the docs
TI-2026-63022 Aliases CVE-2026-93542GHSA-p88p-rg7m-cc93

Out-of-bounds read in libXi's XI2 class parsing via size_classes() and copy_classes()

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 in libXi's XI2 class parsing via size_classes() and copy_classes() in libXi before 1.8.4 could be used by malicous servers to crash the 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: 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.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 1 advisory

  • 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-2026-63023 Out-of-bounds read in libXi's XI2 class parserPriority LOW 32
    • 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
    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 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-2026:71839

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93542
  2. 2026-10-03 Alias added: GHSA-p88p-rg7m-cc93

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