TI-2026-63392 Aliases CVE-2026-94285 GHSA-f73h-qw9f-3h88

Out-of-bounds read in libX11's byte-oriented codeset parser

LOW 22CWE-125Published 2026-09-28 · Updated 2026-09-30

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · None · Low
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.

Summary

An out-of-bounds read in libX11's byte-oriented codeset 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 0.00147 3rd 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

Vendor	Product	Affected versions	Fixed in	Status	Source
x.org	libX11	before 1.8.14	1.8.14	Patch available	CNA

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 · 2026-09-28
x.org libX11 1.8.14
3 records Highest priority Priority LOW 3 LOW
Other records, highest priority first
- TI-2026-63390 Out-of-bounds read vulnerability in libX11's XIM (X Input Method) attribute parserPriority LOW 28
- TI-2026-63391 Out-of-bounds read vulnerability in libX11's XIM trigger-keyregistration parser.registration parserPriority LOW 24
Show all 3 records →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat Hardened Images	Fixed	RHSA-2026:79278

Timeline

2026-10-02 Threatist record created from CVE-2026-94285
2026-10-03 Alias added: GHSA-f73h-qw9f-3h88
2026-10-09 Fix available: RHSA-2026:79278 · Red Hat
2026-10-09 Fix available: Red Hat Hardened Images · Red Hat

References

Patch 1

https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_requests/310/diffs?commit_id=980868483446f24f9658d26aa5bfa42f3da6dd3a

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

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