AlmaLinux alert ALSA-2026:19342 (tigervnc)

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[Announce]  [Security Advisory] ALSA-2026:19342: tigervnc security update (Important)
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Wed, 24 Jun 2026 15:02:00 +0000
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<0100019efa2701b4-cb8529c3-7ddd-4e79-9617-6f574dbe565a-000000@email.amazonses.com>
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Article
Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata
notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-06-24

Summary:

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: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility
map handling (CVE-2026-33999)
  * xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds
read in XKB geometry processing. (CVE-2026-34000)
  * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and
potential memory corruption (CVE-2026-34001)
  * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds
memory access (CVE-2026-34003)
  * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and
denial of service via incorrect permissions (CVE-2026-34352)


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.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/9/ALSA-2026-19342.html

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Kind regards,
AlmaLinux Team
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