Vulnerability · Published Apr 10, 2026 · Assigned by mitre
CVE-2026-40226
Medium 6.4
In plain English
A medium-severity security flaw in systemd from systemd. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)<0.1%top 100.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | systemd | 252.39-1~deb12u2 | DEBIAN-CVE-2026-40226 |
| Debian:13 | systemd | 257.13-1~deb13u1 | DEBIAN-CVE-2026-40226 |
| Debian:14 | systemd | 260~rc3-1 | DEBIAN-CVE-2026-40226 |
| Ubuntu:22.04:LTS | systemd | 249.11-0ubuntu3.21 | USN-8402-1 |
| Ubuntu:22.04:LTS | systemd | 249.11-0ubuntu3.21 | UBUNTU-CVE-2026-40226 |
| Ubuntu:24.04:LTS | systemd | 255.4-1ubuntu8.16 | USN-8402-1 |
| Ubuntu:24.04:LTS | systemd | 255.4-1ubuntu8.16 | UBUNTU-CVE-2026-40226 |
| Ubuntu:25.10 | systemd | 257.9-0ubuntu2.5 | UBUNTU-CVE-2026-40226 |
| Ubuntu:25.10 | systemd | 257.9-0ubuntu2.5 | USN-8402-1 |
Affected products (as reported)
Weakness: CWE-348 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H