Microsoft security update for CVE-2026-33999
🔗 CVE IDs covered (1)
📋 Microsoft's advisory
EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33999. This page also shows what EchelonGraph holds for CVE-2026-33999, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.
🎯 Affected products4
- azl3 xorg-x11-server-Xwayland 24.1.6-3 on Azure Linux 3.0
- azl3 xorg-x11-server-Xwayland 24.1.6-4 on Azure Linux 3.0
- cbl2 xorg-x11-server 1.20.10-16 on CBL Mariner 2.0
- cbl2 xorg-x11-server 1.20.10-16 on CBL-Mariner 2.0
✅ Updates Microsoft lists: 2 updates
2 rows: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.
| KB article | Update | Fixed build |
|---|---|---|
| — | Security Update | — |
| — | Security Update | 24.1.6-4 |
🧭 EchelonGraph on CVE-2026-33999
- EchelonGraph score
- 7.8 HIGH
- CISA KEV
- Not listed
- Fix status
- A fix is available — apply it.
Description from the CVE record (CVE.org), as published by its numbering authority
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.
Published by Red Hat, Inc., the CVE Numbering Authority that assigned CVE-2026-33999, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).