RHSA-2026:46473: Important: tigervnc security update

Published Jul 27, 2026
·
Updated

Important: tigervnc security update

Other sources

Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop environment not only on the machine where it is running, but from anywhere on the Internet and from a wide variety of machine architectures. TigerVNC is a suite of VNC servers and clients.Security Fix(es): xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263) xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264) 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

21 affected componentsFixes available
Red Hat Red Hat Enterprise Linux Server - Extended Life Cycle Support
Red Hat Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)
Red Hat Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian
Red Hat Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian
redhat/tigervnc<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-debuginfo<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-icons<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-license<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server-applet<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server-minimal<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server-module<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-debuginfo<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server-minimal<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-debuginfo<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server-minimal<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5
redhat/tigervnc-server-module<1.8.0-36.el7_9.5
1.8.0-36.el7_9.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/tigervnc to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  2. Upgrade

    Upgrade redhat/tigervnc-debuginfo to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  3. Upgrade

    Upgrade redhat/tigervnc-icons to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  4. Upgrade

    Upgrade redhat/tigervnc-license to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  5. Upgrade

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

    Fixed in 1.8.0-36.el7_9.5
  6. Upgrade

    Upgrade redhat/tigervnc-server-applet to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  7. Upgrade

    Upgrade redhat/tigervnc-server-minimal to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  8. Upgrade

    Upgrade redhat/tigervnc-server-module to a version that resolves this vulnerability.

    Fixed in 1.8.0-36.el7_9.5
  9. Upgrade

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

    Patch CVE-2026-50264
  10. Upgrade

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

    Patch CVE-2026-50262
  11. Upgrade

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

    Patch CVE-2026-50259
  12. Upgrade

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

    Patch CVE-2026-50258
  13. Upgrade

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

    Patch CVE-2026-50260
  14. Upgrade

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

    Patch CVE-2026-50261
  15. Upgrade

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

    Patch CVE-2026-50257
  16. Upgrade

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

    Patch CVE-2026-50263
  17. Upgrade

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

    Patch CVE-2026-50256

Event History

Jul 27, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·08:50 AM
Data Sourced
via Red Hat·08:50 AM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:46473?

The severity of RHSA-2026:46473 is classified as high with a score of 7.

2

How do I fix RHSA-2026:46473?

To fix RHSA-2026:46473, update to the latest version of tigervnc provided in the Red Hat repositories.

3

What vulnerabilities are addressed in RHSA-2026:46473?

RHSA-2026:46473 addresses vulnerabilities including Buffer Overflow and Use After Free in TigerVNC.

4

What software is affected by RHSA-2026:46473?

The software affected by RHSA-2026:46473 includes tigervnc, tigervnc-debuginfo, tigervnc-server, and related packages.

5

When was RHSA-2026:46473 published?

RHSA-2026:46473 was published on July 27, 2026.

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