Prototype Pollution Vulnerability in Cleverbrush Framework Deep
CVE-2026-78654

6.9MEDIUM

Key Information:

Vendor

Cleverbrush

Status
Framework
Deep
Vendor
CVE Published:
25 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-78654?

A vulnerability identified in the Cleverbrush framework allows for improper control over modifications to object prototype attributes via the deepExtend function in deepExtend.ts file. This can lead to potential exploitation by attackers remotely. Users of versions up to 4.4.0 are advised to upgrade their systems to version 4.4.1, which addresses this issue.

Affected Version(s)

deep 4.0

deep 4.1

deep 4.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-78654 - Proof of Concept

References

https://vuldb.com/vuln/394866
vdb-entrytechnical-description
https://vuldb.com/vuln/394866/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-78654
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Classif1ed_mick (VulDB User)
.