AlmaLinux alert ALSA-2026:29844 (tigervnc)

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[Announce]  [Security Advisory] ALSA-2026:29844: tigervnc security update (Important)
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Mon, 29 Jun 2026 11:07:56 +0000
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<0100019f1310826a-0ad6d517-9d56-4335-b8ee-56988cab13ea-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: 2026-06-29

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-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.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/9/ALSA-2026-29844.html

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Kind regards,
AlmaLinux Team
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