CVE-2026-40226

MEDIUMNVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

Score 6.4 from GitHub Security Advisory published 2026-04-10. NVD baseline CVSS 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.4Exploit: NoneExposed: 0

A fix is available — apply it.

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

CVSS v3
6.4
EG Score
6.4(medium)
EPSS
0.1%
KEV
Not listed

Published

April 10, 2026

Last Modified

April 17, 2026

References (1)

Vendor Advisories for CVE-2026-40226(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuudev (249.11-0ubuntu3.21) @ jammy2026-06-15ubuntu
redhatsystemd-main-260.1-2.1.hum12026-04-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 2× in last 7d / 10× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-20 19:32 UTCOSV refresh
  2. 2026-07-18 10:04 UTCEPSS rescore
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-08 15:15 UTCEPSS rescore
  5. 2026-07-07 13:46 UTCEPSS rescore
  6. 2026-07-01 15:06 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-24 14:05 UTCEPSS rescore
  10. 2026-06-23 21:33 UTCEPSS rescore
  11. 2026-06-21 01:59 UTCEPSS rescore
  12. 2026-06-18 17:52 UTCEPSS rescore
  13. 2026-06-18 17:52 UTCEPSS rescore
  14. 2026-06-17 17:53 UTCEPSS rescore
  15. 2026-06-15 17:49 UTCEPSS rescore
  16. 2026-06-15 04:22 UTCVendor advisory
  17. 2026-06-15 04:22 UTCGHSA enrichment
  18. 2026-06-13 23:00 UTCEPSS rescore
  19. 2026-06-12 23:12 UTCEPSS rescore
  20. 2026-06-12 23:12 UTCEPSS rescore
  21. 2026-06-11 19:56 UTCVendor advisory
  22. 2026-06-11 19:56 UTCGHSA enrichment
  23. 2026-06-11 14:00 UTCEPSS rescore
  24. 2026-06-10 22:18 UTCEPSS rescore
  25. 2026-06-10 13:58 UTCVendor advisory
Show 44 more
  1. 2026-06-10 13:58 UTCGHSA enrichment
  2. 2026-06-09 12:41 UTCVendor advisory
  3. 2026-06-09 12:41 UTCGHSA enrichment
  4. 2026-06-08 14:17 UTCEPSS rescore
  5. 2026-06-08 14:17 UTCEPSS rescore
  6. 2026-06-08 09:19 UTCVendor advisory
  7. 2026-06-08 09:18 UTCGHSA enrichment
  8. 2026-06-07 15:25 UTCEPSS rescore
  9. 2026-06-07 15:25 UTCEPSS rescore
  10. 2026-06-07 08:02 UTCVendor advisory
  11. 2026-06-07 08:02 UTCGHSA enrichment
  12. 2026-06-06 13:47 UTCEPSS rescore
  13. 2026-06-06 13:47 UTCEPSS rescore
  14. 2026-06-05 22:47 UTCEPSS rescore
  15. 2026-06-05 06:10 UTCEPSS rescore
  16. 2026-06-05 06:10 UTCEPSS rescore
  17. 2026-06-04 13:12 UTCEPSS rescore
  18. 2026-06-04 13:12 UTCEPSS rescore
  19. 2026-06-02 23:42 UTCVendor advisory
  20. 2026-06-02 23:42 UTCGHSA enrichment
  21. 2026-06-02 20:13 UTCEPSS rescore
  22. 2026-06-01 13:52 UTCEPSS rescore
  23. 2026-06-01 13:52 UTCEPSS rescore
  24. 2026-06-01 13:51 UTCEPSS rescore
  25. 2026-05-31 22:30 UTCEPSS rescore
  26. 2026-05-31 22:30 UTCEPSS rescore
  27. 2026-05-29 13:44 UTCEPSS rescore
  28. 2026-05-29 13:44 UTCEPSS rescore
  29. 2026-05-28 13:44 UTCEPSS rescore
  30. 2026-05-28 13:44 UTCEPSS rescore
  31. 2026-05-28 13:44 UTCEPSS rescore
  32. 2026-05-27 13:40 UTCEPSS rescore
  33. 2026-05-27 13:40 UTCEPSS rescore
  34. 2026-05-27 13:40 UTCEPSS rescore
  35. 2026-05-26 13:44 UTCEPSS rescore
  36. 2026-05-26 07:18 UTCEPSS rescore
  37. 2026-05-26 07:18 UTCEPSS rescore
  38. 2026-05-20 22:38 UTCEPSS rescore
  39. 2026-05-20 22:38 UTCEPSS rescore
  40. 2026-05-20 17:52 UTCEG score recompute
  41. 2026-05-20 17:52 UTCVendor advisory
  42. 2026-05-20 17:52 UTCGHSA enrichment
  43. 2026-05-20 11:22 UTCEPSS rescore
  44. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-40226?
CVE-2026-40226 is a medium vulnerability published on April 10, 2026. In nspawn in systemd 233 through 259 before 260, an escape-to-host action can occur via a crafted optional config file.
When was CVE-2026-40226 disclosed?
CVE-2026-40226 was first published in the National Vulnerability Database on April 10, 2026, with the most recent update on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40226 actively exploited?
CVE-2026-40226 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40226?
CVE-2026-40226 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2026-40226?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40226, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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