What is CVE-2026-40223?

CVE-2026-40223 is a medium-severity vulnerability in Systemd, classified under CWE-696. CVSS score: 4.7/10. Published 2026-04-10.

How severe is CVE-2026-40223?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Systemd

CVE-2026-40223

In systemd 258 before 260, a local unprivileged user can trigger an assert when a Delegate=yes and User=<unset> unit exists and is running.

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

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.9th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.9% 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 258
Systemd Project

Weakness classification (CWE)

CWE-696

References

github.com/systemd/systemd/security/advisories/GHSA-x4h8-rrrg-q78f (Vendor Advisory)

Frequently asked questions

What is CVE-2026-40223?: CVE-2026-40223 is a medium-severity vulnerability in Systemd, classified under CWE-696. CVSS score: 4.7/10. Published 2026-04-10.
How severe is CVE-2026-40223?: Medium severity. CVSS v3 base score is 4.7 out of 10.