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

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.

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

MEDIUM · CVSS 6.4 EPSS 0.0001
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-348Use of Less Trusted Source
▤

Affected Products & Versions

3
systemd project systemd>= 233 and < 257.12
systemd project systemd>= 258 and < 258.6
systemd project systemd>= 259 and < 259.4
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSystemd Service Creation
▣

Scoring & Timeline

6.4
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Apr 2026 · 04:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
msrcCVE-2026-40226
rhsaRHSA-2026:7299Low
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/systemd/systemd/security/advisories/GHSA-9mj4-rrc3-gjcxVendor Advisory
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