RHSA-2026:98461: Important: libX11 security update
Published Nov 11, 2026
·Updated
The libX11 packages contain the core X11 protocol client library.Security Fix(es): libX11: libX11: Heap-based buffer overflow via malicious X server (CVE-2026-88806) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Affected Software
0 affected components
Event History
Nov 11, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Frequently Asked Questions
1
What must an attacker control to trigger this issue?
The issue is triggered through a malicious X server. Systems are exposed when a libX11 client interacts with an attacker-controlled X server.