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Fencer Vulns
high 7.4

CVE-2026-93543 json

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

published 2026-09-24 45 d ago modified 2026-09-24 45 d ago also EUVD-2026-86121

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

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.

Patch / fix

  • x.org libXi 1.8.4
  • libxi Debian 14 2:1.8.4-1

debian advisories DEBIAN-CVE-2026-93543

  • libXi hummingbird 1 1.8.3-2.1.hum1

red hat advisories RHSA-2026:71839

  • libXi Linux Micro 6.0 1.8.1-159998.1.1
  • libXi SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.8.2-160000.4.1

suse advisories SUSE-SU-2026:24366-1SUSE-SU-2026:24119-1SUSE-SU-2026:24203-1

  • libXi openSUSE Leap 16.0 1.8.2-160000.4.1
  • libXi openSUSE Tumbleweed 1.8.3-2.1

opensuse advisories openSUSE-SU-2026:22054-1openSUSE-SU-2026:11895-1

  • libXi AlmaLinux 10 1.8.1-7.el10_2.1
  • libXi AlmaLinux 9 1.7.10-8.el9_8.1
  • libXi AlmaLinux 8 1.7.10-2.el8_10

almalinux advisories ALSA-2026:91004ALSA-2026:91056ALSA-2026:91268

  • libXi Rocky Linux 9 1.7.10-8.el9_8.1
  • libXi Rocky Linux 10 1.8.1-7.el10_2.1
  • libXi Rocky Linux 8 1.7.10-2.el8_10

rocky linux advisories RLSA-2026:91056RLSA-2026:91004RLSA-2026:91268

  • libxi Alpine 3.24 1.8.4-r0

alpine advisories ALPINE-CVE-2026-93543

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

  • libXi Azure Linux 3.0 1.8.4-1

azure linux advisories AZL-104066

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-2026-93543 updated cvss 6.5

libXi: libXi: Denial of Service via out-of-bounds read in XI2 class parser

  • Red Hat Enterprise Linux 6 libXi
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libXi
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) libXi 1.7.10-2.el8_10
    fixed: vendor fix RHSA-2026:91268
  • Red Hat Enterprise Linux AppStream (v. 9) libXi 1.7.10-8.el9_8.1
    fixed: vendor fix RHSA-2026:91056
  • Red Hat Enterprise Linux AppStream (v. 10) libXi 1.8.1-7.el10_2.1
    fixed: vendor fix RHSA-2026:91004
  • Red Hat Hardened Images libXi 1.8.3-2.1.hum1
    fixed: vendor fix RHSA-2026:71839

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
45 d ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H

Affected products

  • x.org libXi

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.