MEDIUM 6.4 Microsoft
CVE-2026-40226
In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.
Microsoft Security Update 2026-Apr: In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.
Affected Products
- azl3 systemd 255-26 on Azure Linux 3.0
- cbl2 systemd 250.3-24 on CBL Mariner 2.0
- azl3 systemd 255-27 on Azure Linux 3.0
- azl3 systemd 255-30 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40226
- https://nvd.nist.gov/vuln/detail/CVE-2026-40226
This medium severity vulnerability with a CVSS score of 6.4 was published on 2026-04-14 via Microsoft. Affected: azl3 systemd 255-26 on Azure Linux 3.0, cbl2 systemd 250.3-24 on CBL Mariner 2.0, azl3 systemd 255-27 on Azure Linux 3.0 and 1 more.
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