Microsoft security update for CVE-2026-40226
🔗 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-2026-40226. This page also shows what EchelonGraph holds for CVE-2026-40226, 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 products5
- azl3 systemd 255-26 on Azure Linux 3.0
- azl3 systemd 255-27 on Azure Linux 3.0
- azl3 systemd 255-30 on Azure Linux 3.0
- cbl2 systemd 250.3-24 on CBL Mariner 2.0
- cbl2 systemd 250.3-24 on CBL-Mariner 2.0
✅ Updates Microsoft lists: 3 updates
3 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 | 255-28 |
| — | Security Update | 255-30 |
| — | Security Update | — |
🧭 EchelonGraph on CVE-2026-40226
- EchelonGraph score
- 6.4 MEDIUM
- 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
In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.
Published by MITRE Corporation, the CVE Numbering Authority that assigned CVE-2026-40226, 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).