Out-of-bounds Read Vulnerability in libX11 Affects Multiple X Clients
CVE-2026-94285

5.1MEDIUM

Key Information:

Vendor

X.org

Status
Libx11
Vendor
CVE Published:
28 September 2026

What is CVE-2026-94285?

An out-of-bounds read issue has been identified in the byte-oriented codeset parser of libX11 prior to version 1.8.14. This vulnerability allows malicious X servers to exploit the flaw, potentially leading to instability and crashes of the attached X clients. The issue stems from improper handling of input, which can result in reading beyond the intended memory boundaries.

Affected Version(s)

libX11 0 < 1.8.14

References

https://gitlab.freedesktop.org/xorg/lib/libx11/-/merge_re...
patch

CVSS V3.1

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

AISLE in partnership with Red Hat
.