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 — 5 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
10.9%
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(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 18× 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. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:10 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-21 15:24 UTCEPSS rescore
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-20 16:36 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  8. 2026-07-20 15:22 UTCMITRE cvelistV5CVSS v3 → 2.9 · severity → LOW
  9. 2026-07-19 14:31 UTCEPSS rescore
  10. 2026-07-19 02:29 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-17 06:47 UTCEG score recompute▲ 7.50
  13. 2026-07-17 06:47 UTCGHSA enrichment
  14. 2026-07-16 17:03 UTCEPSS rescore
  15. 2026-07-16 15:53 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  16. 2026-07-15 22:24 UTCNVD update
  17. 2026-07-15 21:24 UTCEG score recompute
  18. 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 10.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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