An update for tigervnc is now available for Red Hat Enterprise Linux 8.8
 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of
 Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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):

* X.Org: Xwayland: Use-after-free of the root cursor (CVE-2025-26594)

* xorg: xwayland: Use-after-free in SyncInitTrigger() (CVE-2025-26601)

* xorg: xwayland: Use-after-free in PlayReleasedEvents() (CVE-2025-26600)

* xorg: xwayland: Use of uninitialized pointer in compRedirectWindow()
 (CVE-2025-26599)

* xorg: xwayland: Out-of-bounds write in CreatePointerBarrierClient()
 (CVE-2025-26598)

* xorg: xwayland: Buffer overflow in XkbChangeTypesOfKey() (CVE-2025-26597)

* xorg: xwayland: Heap overflow in XkbWriteKeySyms() (CVE-2025-26596)

* Xorg: xwayland: Buffer overflow in XkbVModMaskText() (CVE-2025-26595)

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.

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CVE-2025-26594: Use After Free (CWE-416)
CVE-2025-26595: Stack-based Buffer Overflow (CWE-121)
CVE-2025-26596: Heap-based Buffer Overflow (CWE-122)
CVE-2025-26597: Heap-based Buffer Overflow (CWE-122)
CVE-2025-26598: Out-of-bounds Write (CWE-787)
CVE-2025-26599: Access of Uninitialized Pointer (CWE-824)
CVE-2025-26600: Use After Free (CWE-416)
CVE-2025-26601: Use After Free (CWE-416)