ALAS2023-2026-1943

Amazon Linux 2023 Security Advisory: ALAS2023-2026-1943
Advisory Released Date: 2026-07-20
Advisory Updated Date: 2026-07-20
Severity: Important
Issue Overview:

glamor Font Atlas Heap Buffer Overflow (CVE-2026-55999)


Affected Packages:

xorg-x11-server


Issue Correction:
Run dnf update xorg-x11-server --releasever 2023.12.20260720 or dnf update --advisory ALAS2023-2026-1943 --releasever 2023.12.20260720 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:
aarch64:
    xorg-x11-server-Xorg-debuginfo-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xorg-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xnest-debuginfo-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xvfb-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xephyr-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-common-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-devel-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xvfb-debuginfo-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-debuginfo-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xephyr-debuginfo-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-Xnest-21.1.13-5.amzn2023.0.11.aarch64
    xorg-x11-server-debugsource-21.1.13-5.amzn2023.0.11.aarch64

noarch:
    xorg-x11-server-source-21.1.13-5.amzn2023.0.11.noarch

src:
    xorg-x11-server-21.1.13-5.amzn2023.0.11.src

x86_64:
    xorg-x11-server-debuginfo-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-common-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xephyr-debuginfo-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-debugsource-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xnest-debuginfo-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xorg-debuginfo-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xvfb-debuginfo-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xorg-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xnest-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xephyr-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-devel-21.1.13-5.amzn2023.0.11.x86_64
    xorg-x11-server-Xvfb-21.1.13-5.amzn2023.0.11.x86_64

Additional References

Release Notes:  Amazon Linux 2023 Release Notes

Red Hat: CVE-2026-55999

Mitre: CVE-2026-55999