CVE-2026-78654

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory published 2026-08-25. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.3Exploit: Elevated riskExposed: 0

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

A vulnerability has been found in cleverbrush framework and deep up to 4.4.0. This impacts the function deepExtend of the file libs/deep/src/deepExtend.ts. The manipulation leads to improperly controlled modification of object prototype attributes. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. Upgrading to version 4.4.1 will fix this issue. The identifier of the patch is 810398c1308c500c3b8b6af380b5a89371389327. You should upgrade the affected component.

CVSS v3
7.3
EG Score
7.3(high)
EG Risk
64(Attend)
EG Risk 64/100SSVC: Attend

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
Severity73% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 26, 2026

Advisory Details (3)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr.
generic

GitHub - cleverbrush/framework: A collection of lightweight, strongly-typed TypeScript utility libraries — schema validation with type inference, async helpers, deep object operations, object mapping, job scheduling, and more. · GitHub

https://github.com/cleverbrush/framework/
github_pr Patch Available

v4.4.1

Patch available: cleverbrush/framework @cleverbrush/[email protected] (PR #215 merged 2026-07-13)

https://github.com/cleverbrush/framework/pull/215
generic🟡 PoC Available

Prototype pollution in deepExtend() via unguarded __proto__ key in recursive merge · Issue #213 · cleverbrush/framework · GitHub

https://github.com/cleverbrush/framework/issues/213

Vendor Advisories for CVE-2026-78654(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 16× in last 7d / 16× 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. 2026-08-26 16:44 UTCGHSA enrichment
  2. 2026-08-26 15:13 UTCEG score recompute
  3. 2026-08-26 15:13 UTCGHSA enrichment
  4. 2026-08-26 14:47 UTCEPSS rescore
  5. 2026-08-26 02:47 UTCGHSA enrichment
  6. 2026-08-25 14:21 UTCEG score recompute
  7. 2026-08-25 14:21 UTCGHSA enrichment
  8. 2026-08-25 14:20 UTCNVD updateCVSS v4 → 5.5
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-25 13:36 UTCEG score recompute
  11. 2026-08-25 13:36 UTCGHSA enrichment
  12. 2026-08-25 13:35 UTCMITRE cvelistV5CVSS v4 → 6.9
  13. 2026-08-25 06:28 UTCEG score recompute
  14. 2026-08-25 06:26 UTCNVD updateCVSS v4 → 5.5
  15. 2026-08-25 06:05 UTCEG score recompute
  16. 2026-08-25 06:05 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78654?
CVE-2026-78654 is a high vulnerability published on August 25, 2026. A vulnerability has been found in cleverbrush framework and deep up to 4.4.0. This impacts the function deepExtend of the file libs/deep/src/deepExtend.ts. The manipulation leads to improperly controlled modification of object prototype attributes. Remote exploitation of the attack is possible. The…
When was CVE-2026-78654 disclosed?
CVE-2026-78654 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78654 actively exploited?
CVE-2026-78654 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 65.5% of all scored CVEs.
What is the CVSS score of CVE-2026-78654?
CVE-2026-78654 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-78654?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78654, 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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