Use After Free Affecting tigervnc-server-minimal package, versions <0:1.12.0-14.el9_2.15


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.15% (5th percentile)

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  • Snyk IDSNYK-RHEL9-TIGERVNCSERVERMINIMAL-18322285
  • published27 Jul 2026
  • disclosed2 Jun 2026

Introduced: 2 Jun 2026

CVE-2026-50260  (opens in a new tab)
CWE-416  (opens in a new tab)

How to fix?

Upgrade RHEL:9 tigervnc-server-minimal to version 0:1.12.0-14.el9_2.15 or higher.
This issue was patched in RHSA-2026:46377.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tigervnc-server-minimal package and not the tigervnc-server-minimal package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.

CVSS Base Scores

version 3.1