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
6.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.4Exploit: Elevated riskExposed: 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)
EG Risk
45(Track*)
EG Risk 45/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity64% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

April 10, 2026

Last Modified

April 17, 2026

Advisory Details (1)

Auto-updated Aug 2, 2026
Patch available. Sources: github.
github Patch Available

nspawn: escape-to-host via malformed optional config file · Advisory · systemd/systemd · GitHub

https://github.com/systemd/systemd/security/advisories/GHSA-9mj4-rrc3-gjcx

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
systemd247.3-6 ... 247.3-7+deb11u7 (9 versions)247.3-7+deb11u8—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
systemd252.11-1 ... 252.6-1+loong64 (31 versions)252.39-1~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
systemd257.7-1, 257.8-1~deb13u1, 257.8-1~deb13u2, 257.9-1~deb13u1257.13-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
systemd257.13-1~deb13u1 ... 260~rc2-1 (21 versions)260~rc3-1—

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 4× in last 7d / 11× 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.

Showing the most recent 100 of 120 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-16 14:08 UTCEPSS rescore
  4. 2026-09-13 16:47 UTCEPSS rescore
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-04 05:06 UTCEPSS rescore
  8. 2026-09-02 06:44 UTCOSV refresh
  9. 2026-08-28 21:41 UTCEPSS rescore
  10. 2026-08-26 14:46 UTCEPSS rescore
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-19 17:03 UTCEPSS rescore
  13. 2026-08-16 07:03 UTCVendor advisory
  14. 2026-08-16 07:03 UTCGHSA enrichment
  15. 2026-08-14 05:02 UTCVendor advisory
  16. 2026-08-14 05:02 UTCGHSA enrichment
  17. 2026-08-12 19:15 UTCEG score recompute
  18. 2026-08-12 19:15 UTCVendor advisory
  19. 2026-08-12 19:15 UTCGHSA enrichment
  20. 2026-08-11 13:43 UTCEPSS rescore
  21. 2026-08-11 07:01 UTCVendor advisory
  22. 2026-08-11 07:01 UTCGHSA enrichment
  23. 2026-08-10 05:44 UTCVendor advisory
  24. 2026-08-10 05:44 UTCGHSA enrichment
  25. 2026-08-09 04:28 UTCEG score recompute
Show 75 more
  1. 2026-08-09 04:28 UTCVendor advisory
  2. 2026-08-09 04:28 UTCGHSA enrichment
  3. 2026-08-08 16:37 UTCEPSS rescore
  4. 2026-08-07 14:19 UTCEG score recompute
  5. 2026-08-07 14:19 UTCVendor advisory
  6. 2026-08-07 14:19 UTCGHSA enrichment
  7. 2026-08-06 13:46 UTCEPSS rescore
  8. 2026-08-05 23:40 UTCEG score recompute
  9. 2026-08-05 23:40 UTCVendor advisory
  10. 2026-08-05 23:40 UTCGHSA enrichment
  11. 2026-08-05 19:17 UTCEPSS rescore
  12. 2026-08-03 21:55 UTCVendor advisory
  13. 2026-08-03 21:55 UTCGHSA enrichment
  14. 2026-08-02 13:46 UTCEG score recompute
  15. 2026-08-02 13:46 UTCVendor advisory
  16. 2026-08-02 13:46 UTCGHSA enrichment
  17. 2026-08-02 02:27 UTCEPSS rescore
  18. 2026-07-30 16:28 UTCEPSS rescore
  19. 2026-07-30 01:30 UTCEPSS rescore
  20. 2026-07-26 14:54 UTCEPSS rescore
  21. 2026-07-26 14:54 UTCEPSS rescore
  22. 2026-07-24 14:17 UTCEPSS rescore
  23. 2026-07-24 14:17 UTCEPSS rescore
  24. 2026-07-23 14:18 UTCEPSS rescore
  25. 2026-07-23 14:18 UTCEPSS rescore
  26. 2026-07-23 03:11 UTCEG score recompute
  27. 2026-07-20 19:32 UTCOSV refresh
  28. 2026-07-18 10:04 UTCEPSS rescore
  29. 2026-07-13 22:30 UTCEPSS rescore
  30. 2026-07-08 15:15 UTCEPSS rescore
  31. 2026-07-07 13:46 UTCEPSS rescore
  32. 2026-07-01 15:06 UTCEPSS rescore
  33. 2026-06-28 04:56 UTCEPSS rescore
  34. 2026-06-27 03:08 UTCEPSS rescore
  35. 2026-06-24 14:05 UTCEPSS rescore
  36. 2026-06-23 21:33 UTCEPSS rescore
  37. 2026-06-21 01:59 UTCEPSS rescore
  38. 2026-06-18 17:52 UTCEPSS rescore
  39. 2026-06-18 17:52 UTCEPSS rescore
  40. 2026-06-17 17:53 UTCEPSS rescore
  41. 2026-06-15 17:49 UTCEPSS rescore
  42. 2026-06-15 04:22 UTCVendor advisory
  43. 2026-06-15 04:22 UTCGHSA enrichment
  44. 2026-06-13 23:00 UTCEPSS rescore
  45. 2026-06-12 23:12 UTCEPSS rescore
  46. 2026-06-12 23:12 UTCEPSS rescore
  47. 2026-06-11 19:56 UTCVendor advisory
  48. 2026-06-11 19:56 UTCGHSA enrichment
  49. 2026-06-11 14:00 UTCEPSS rescore
  50. 2026-06-10 22:18 UTCEPSS rescore
  51. 2026-06-10 13:58 UTCVendor advisory
  52. 2026-06-10 13:58 UTCGHSA enrichment
  53. 2026-06-09 12:41 UTCVendor advisory
  54. 2026-06-09 12:41 UTCGHSA enrichment
  55. 2026-06-08 14:17 UTCEPSS rescore
  56. 2026-06-08 14:17 UTCEPSS rescore
  57. 2026-06-08 09:19 UTCVendor advisory
  58. 2026-06-08 09:18 UTCGHSA enrichment
  59. 2026-06-07 15:25 UTCEPSS rescore
  60. 2026-06-07 15:25 UTCEPSS rescore
  61. 2026-06-07 08:02 UTCVendor advisory
  62. 2026-06-07 08:02 UTCGHSA enrichment
  63. 2026-06-06 13:47 UTCEPSS rescore
  64. 2026-06-06 13:47 UTCEPSS rescore
  65. 2026-06-05 22:47 UTCEPSS rescore
  66. 2026-06-05 06:10 UTCEPSS rescore
  67. 2026-06-05 06:10 UTCEPSS rescore
  68. 2026-06-04 13:12 UTCEPSS rescore
  69. 2026-06-04 13:12 UTCEPSS rescore
  70. 2026-06-02 23:42 UTCVendor advisory
  71. 2026-06-02 23:42 UTCGHSA enrichment
  72. 2026-06-02 20:13 UTCEPSS rescore
  73. 2026-06-01 13:52 UTCEPSS rescore
  74. 2026-06-01 13:52 UTCEPSS rescore
  75. 2026-06-01 13:51 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% probability of exploitation in the next 30 days, which ranks it in the top 99.9% of all scored CVEs.
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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