CVE-2026-40226

EUVD-2026-21400
In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mitreCNA
6.4 MEDIUM
LOCAL
HIGH
HIGH
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
systemd_projectsystemd
233 ≤
𝑥
< 260
CNA
Debian logo
Debian Releases
Debian Product
Codename
systemd
bookworm
no-dsa
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
forky
260.1-1
fixed
sid
260.1-1
fixed
trixie
no-dsa
Common Weakness Enumeration
References
https://github.com/systemd/systemd/security/advisories/GHSA-9mj4-rrc3-gjcx