High ALAS2023-2026-3179 1 CVE

Important: libX11 security update (Amazon Linux 2023)

Published Oct 12, 2026 · Updated Oct 12, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-88806: A malicious X server could exploit a buffer overflow in libX11 before 1.8.14 during handling of XkbGetMap overflowing the key_sym_map.

Fixed packages 7

Release	Package	Fixed in
Amazon Linux · 2023	libX11	0:1.8.10-2.amzn2023.0.2
Amazon Linux · 2023	libX11-common	0:1.8.10-2.amzn2023.0.2
Amazon Linux · 2023	libX11-debuginfo	0:1.8.10-2.amzn2023.0.2
Amazon Linux · 2023	libX11-debugsource	0:1.8.10-2.amzn2023.0.2
Amazon Linux · 2023	libX11-devel	0:1.8.10-2.amzn2023.0.2
Amazon Linux · 2023	libX11-xcb	0:1.8.10-2.amzn2023.0.2
Amazon Linux · 2023	libX11-xcb-debuginfo	0:1.8.10-2.amzn2023.0.2

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

References

web
https://alas.aws.amazon.com/cve/html/CVE-2026-88806.html