High ELSA-2026-91366 1 CVE

Important: libX11 security update (Oracle Linux 10)

Published Oct 27, 2026 · Updated Oct 27, 2026

Ecosystem: Oracle Linux

Summary

[1.8.10-1.1]
- CVE-2026-88806 libX11: libX11: Heap-based buffer overflow via malicious X server
X server
Resolves: https://issues.redhat.com/browse/RHEL-267123

Fixed packages 4

Release	Package	Fixed in
Oracle Linux · 10	libX11	0:1.8.10-1.el10_2.1
Oracle Linux · 10	libX11-common	0:1.8.10-1.el10_2.1
Oracle Linux · 10	libX11-devel	0:1.8.10-1.el10_2.1
Oracle Linux · 10	libX11-xcb	0:1.8.10-1.el10_2.1

Vulnerabilities 1

High 7.5

CVE-2026-88806

libX11 XkbGetMap Reply Heap-based Buffer Overflow

A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.

X.Org libX11 libx11 libx11 Debian Ubuntu Azure Linux Alpine

Sep 21, 2026