CVE-2026-38755

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

A heap overflow in the evalcommand() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 20, 2026

Advisory Details (2)

Auto-updated Jul 16, 2026
No patch confirmed yet.
generic

[PATCH] ash: fix stack overflow in evalfun()

https://lists.busybox.net/pipermail/busybox/2026-June/092354.html
generic
https://busybox.com

Vendor Advisories for CVE-2026-38755(3)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatbusybox-main-1.37.0-8.2.hum12026-07-20redhat

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
busybox1:1.30.1-6 ... 1:1.38.0-3 (35 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.35.0-4 ... 1:1.38.0-3 (28 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.37.0-10 ... 1:1.38.0-3 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
busybox1:1.37.0-10 ... 1:1.38.0-2 (8 versions)1:1.38.0-3—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 112× 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 236 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-38755?
CVE-2026-38755 is a high vulnerability published on July 15, 2026. A heap overflow in the evalcommand() function (shell/ash.c) of Busybox v1.38.0 allows attackers to cause a Denial of Service (DoS) via supplying a crafted input.
When was CVE-2026-38755 disclosed?
CVE-2026-38755 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-38755 actively exploited?
CVE-2026-38755 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 72.6% of all scored CVEs.
What is the CVSS score of CVE-2026-38755?
CVE-2026-38755 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-38755?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-38755, 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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