RHSA-2026:49608: Important: xorg-x11-server security update

Published Aug 3, 2026
·
Updated

Important: xorg-x11-server security update

Other sources

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.

— Red Hat

Affected Software

35 affected componentsFixes available
Red Hat Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux Server - AUS
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Red Hat Enterprise Linux for ARM 64 - 4 years of updates
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Red Hat CodeReady Linux Builder for IBM z Systems - Extended Update Support
Red Hat Red Hat Enterprise Linux for IBM z Systems - 4 years of updates
Red Hat Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
redhat/xorg-x11-server<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-common<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-debuginfo<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-debugsource<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-common<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-debuginfo<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-debugsource<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-common<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-debuginfo<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-debugsource<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-common<1.20.11-34.el9_6.1.aa
1.20.11-34.el9_6.1.aa
redhat/xorg-x11-server-debuginfo<1.20.11-34.el9_6.1.aa
1.20.11-34.el9_6.1.aa
redhat/xorg-x11-server-debugsource<1.20.11-34.el9_6.1.aa
1.20.11-34.el9_6.1.aa
redhat/xorg-x11-server-devel<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-devel<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-source<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-devel<1.20.11-34.el9_6.1
1.20.11-34.el9_6.1
redhat/xorg-x11-server-devel<1.20.11-34.el9_6.1.aa
1.20.11-34.el9_6.1.aa

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 1.20.11-34.el9_6.1
  2. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1
  3. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1
  4. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1
  5. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1.aa
  6. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1.aa
  7. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1.aa
  8. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1
  9. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1
  10. Upgrade

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

    Fixed in 1.20.11-34.el9_6.1.aa

Event History

Aug 3, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·06:56 AM
Data Sourced
via Red Hat·06:56 AM
Severity
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