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Test your applicationsUpgrade Amazon-Linux:2 tigervnc-debuginfo to version 0:1.8.0-24.amzn2.0.11 or higher.
This issue was patched in ALAS2-2026-4013.
Note: Versions mentioned in the description apply only to the upstream tigervnc-debuginfo package and not the tigervnc-debuginfo package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.