CVE & CISA-KEV Catalog

CVE-2026-40226

MEDIUM
6.4
CVSS v3
NVD

Description

In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.

CWE-348

How to fix

Remediation Available
systemdDebian
Fixed in:247.3-7+deb11u8CVE-2026-40226
Fixed in:252.39-1~deb12u2CVE-2026-40226
Fixed in:257.13-1~deb13u1CVE-2026-40226
Fixed in:260~rc3-1CVE-2026-40226
libnss-resolveUbuntu
Fixed in:249.11-0ubuntu3.21USN-8402-1
libsystemd0Ubuntu
Fixed in:249.11-0ubuntu3.21USN-8402-1
Fixed in:255.4-1ubuntu8.16USN-8402-1
Fixed in:257.9-0ubuntu2.5USN-8402-1
libudev1Ubuntu
Fixed in:249.11-0ubuntu3.21USN-8402-1
Fixed in:255.4-1ubuntu8.16USN-8402-1
Fixed in:257.9-0ubuntu2.5USN-8402-1
systemdUbuntu
Fixed in:249.11-0ubuntu3.21USN-8402-1
Fixed in:255.4-1ubuntu8.16USN-8402-1
Fixed in:257.9-0ubuntu2.5USN-8402-1
udevUbuntu
Fixed in:249.11-0ubuntu3.21USN-8402-1
Fixed in:255.4-1ubuntu8.16USN-8402-1
Fixed in:257.9-0ubuntu2.5USN-8402-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredHigh
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.07%probability of exploitation in 30 days
0thpercentile

Low risk: more likely to be exploited than 0% of all known CVEs.

References

Vendor Advisory1
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CVE-2026-40226 severity badge

Markdown

[![CVE-2026-40226](https://tridentstack.com/cve/badge/CVE-2026-40226.svg)](https://tridentstack.com/cve/CVE-2026-40226)

HTML

<a href="https://tridentstack.com/cve/CVE-2026-40226"><img src="https://tridentstack.com/cve/badge/CVE-2026-40226.svg" alt="CVE-2026-40226"></a>

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-17.