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Vulnerabilities

Vulnerability · 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.

Published Apr 10, 2026 · catalog updated Jun 17, 2026 · systemd project

Check if you run it

No confirmed exploitation is on record for CVE-2026-40226. EPSS is 0.09%. Act only if a listed version of systemd project is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.4
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.09%
Remediation
Advisory link
Affected products
cpe systemd project/systemd

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe systemd project/systemdversion unspecified

How to fix CVE-2026-40226

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40226. EPSS is 0.09%. Act only if a listed version of systemd project is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-348. EPSS 0.09%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 10, 2026 · NIST NVD

    Detected

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

  2. Jun 17, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-40226

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40226

    30-day exploitation probability 0.1%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40226

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.