MEDIUM 6.6 Microsoft

CVE-2026-33999

Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

Microsoft Security Update 2026-Apr: Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

Affected Products

cbl2 xorg-x11-server 1.20.10-16 on CBL Mariner 2.0
azl3 xorg-x11-server-Xwayland 24.1.6-3 on Azure Linux 3.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33999
https://nvd.nist.gov/vuln/detail/CVE-2026-33999

Published: 2026-04-14 · Source: Microsoft · Feed updated: 2026-08-04

This medium severity vulnerability with a CVSS score of 6.6 was published on 2026-04-14 via Microsoft. Affected: cbl2 xorg-x11-server 1.20.10-16 on CBL Mariner 2.0, azl3 xorg-x11-server-Xwayland 24.1.6-3 on Azure Linux 3.0.

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