Stack-based Buffer Overflow The advisory has been revoked - it doesn't affect any version of package tigervnc-server-applet (opens in a new tab)

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0.17% (6^th percentile)

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Snyk IDSNYK-RHEL7-TIGERVNCSERVERAPPLET-17327779
published12 Jun 2026
disclosed2 Jun 2026

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Introduced: 2 Jun 2026

CVE-2026-50259 (opens in a new tab) CWE-121 (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:7.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tigervnc-server-applet package and not the tigervnc-server-applet package as distributed by RHEL.

A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.