RHSA-2026:49606: Important: xorg-x11-server security update

Published Aug 3, 2026
·
Updated

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.Security Fix(es): xorg: X11: xserver: X.org: glamor Font Atlas Heap Buffer Overflow (CVE-2026-55999) 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

4 affected componentsFixes available
redhat/xorg-x11-server<1.20.10-5.el8_4.1
1.20.10-5.el8_4.1
redhat/xorg-x11-server-common<1.20.10-5.el8_4.1
1.20.10-5.el8_4.1
redhat/xorg-x11-server-debuginfo<1.20.10-5.el8_4.1
1.20.10-5.el8_4.1
redhat/xorg-x11-server-debugsource<1.20.10-5.el8_4.1
1.20.10-5.el8_4.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/xorg-x11-server to a version that resolves this vulnerability.

    Fixed in 1.20.10-5.el8_4.1
  2. Upgrade

    Upgrade redhat/xorg-x11-server-common to a version that resolves this vulnerability.

    Fixed in 1.20.10-5.el8_4.1
  3. Upgrade

    Upgrade redhat/xorg-x11-server-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.20.10-5.el8_4.1
  4. Upgrade

    Upgrade redhat/xorg-x11-server-debugsource to a version that resolves this vulnerability.

    Fixed in 1.20.10-5.el8_4.1

Event History

Aug 3, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of RHSA-2026:49606?

The severity of RHSA-2026:49606 is classified as important.

2

How do I fix RHSA-2026:49606?

To fix RHSA-2026:49606, update the affected xorg-x11-server packages to the latest version provided by Red Hat.

3

What vulnerability does RHSA-2026:49606 address?

RHSA-2026:49606 addresses a heap buffer overflow vulnerability in the glamor Font Atlas component of the X.Org server.

4

Which software is affected by RHSA-2026:49606?

The affected software includes redhat/xorg-x11-server, redhat/xorg-x11-server-common, redhat/xorg-x11-server-debuginfo, and redhat/xorg-x11-server-debugsource.

5

What is CVE-2026-55999 related to RHSA-2026:49606?

CVE-2026-55999 describes the specific heap buffer overflow vulnerability that RHSA-2026:49606 mitigates.

Company

Resources

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