What is CVE-2026-40226?

CVE-2026-40226 is a medium-severity vulnerability in Systemd, classified under CWE-348. CVSS score: 6.4/10. Published 2026-04-10.

How severe is CVE-2026-40226?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Vulnerability in Systemd

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 2026-04-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (0.6th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Systemd — versions 233
Systemd Project

Weakness classification (CWE)

CWE-348

References

github.com/systemd/systemd/security/advisories/GHSA-9mj4-rrc3-gjcx (Vendor Advisory)

Frequently asked questions

What is CVE-2026-40226?: CVE-2026-40226 is a medium-severity vulnerability in Systemd, classified under CWE-348. CVSS score: 6.4/10. Published 2026-04-10.
How severe is CVE-2026-40226?: Medium severity. CVSS v3 base score is 6.4 out of 10.