CVE-2026-38755

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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 — 6 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(high)
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
11%
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.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 33× 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. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-27 12:47 UTCVendor advisory
  3. 2026-07-27 12:47 UTCGHSA enrichment
  4. 2026-07-27 00:15 UTCEG score recompute
  5. 2026-07-27 00:15 UTCVendor advisory
  6. 2026-07-27 00:15 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 11:39 UTCEG score recompute
  10. 2026-07-26 11:39 UTCVendor advisory
  11. 2026-07-26 11:39 UTCGHSA enrichment
  12. 2026-07-25 14:18 UTCEPSS rescore
  13. 2026-07-25 14:18 UTCEPSS rescore
  14. 2026-07-24 14:17 UTCEPSS rescore
  15. 2026-07-24 14:17 UTCEPSS rescore
  16. 2026-07-23 14:18 UTCEPSS rescore
  17. 2026-07-23 14:18 UTCEPSS rescore
  18. 2026-07-23 03:10 UTCEG score recompute
  19. 2026-07-22 14:08 UTCEPSS rescore
  20. 2026-07-21 15:24 UTCEPSS rescore
  21. 2026-07-20 17:08 UTCEPSS rescore
  22. 2026-07-20 16:36 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  23. 2026-07-20 15:22 UTCMITRE cvelistV5CVSS v3 → 2.9 · severity → LOW
  24. 2026-07-19 14:31 UTCEPSS rescore
  25. 2026-07-19 02:29 UTCEPSS rescore
Show 8 more
  1. 2026-07-18 10:04 UTCEPSS rescore
  2. 2026-07-17 06:47 UTCEG score recompute▲ 7.50
  3. 2026-07-17 06:47 UTCGHSA enrichment
  4. 2026-07-16 17:03 UTCEPSS rescore
  5. 2026-07-16 15:53 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  6. 2026-07-15 22:24 UTCNVD update
  7. 2026-07-15 21:24 UTCEG score recompute
  8. 2026-07-15 21:23 UTCMITRE cvelistV5first tracked

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 89.0% 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

Explore the affected products and dependency analysis for CVE-2026-38755

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