RHSA-2026:99565: Important: libX11 security update
Published Nov 12, 2026
·Updated
Important: libX11 security update
Other sources
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.
— Red Hat
Affected Software
4 affected components
Red Hat Red Hat Enterprise Linux Server - TUS
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Event History
Nov 12, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·09:05 AM
Data Sourced
via Red Hat·09:05 AM
Severity