VDB-394866 · Submit #886401 · CVE-2026-78654

cleverbrush framework/deep up to 4.4.0 deepExtend.ts deepExtend prototype pollution

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6	$0-$5k	2.02+

Summaryinfo

A vulnerability labeled as critical has been found in cleverbrush framework and deep up to 4.4.0. Affected is the function deepExtend of the file libs/deep/src/deepExtend.ts. The manipulation results in prototype pollution. This vulnerability is identified as CVE-2026-78654. The attack can be executed remotely. Additionally, an exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in cleverbrush framework and deep up to 4.4.0. Affected is the function deepExtend of the file libs/deep/src/deepExtend.ts. The manipulation with an unknown input leads to a prototype pollution vulnerability. CWE is classifying the issue as CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-78654. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details and a public exploit are known. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

The exploit is shared for download at github.com. It is declared as proof-of-concept.

Upgrading to version 4.4.1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 810398c1308c500c3b8b6af380b5a89371389327 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

cleverbrush

Name

Version

License

open-source

Website

Product: https://github.com/cleverbrush/framework/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Prototype pollution
CWE: CWE-1321 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: framework/deep 4.4.1
Patch: 810398c1308c500c3b8b6af380b5a89371389327

Timelineinfo

08/24/2026 VulDB entry created
08/25/2026 +0 days Advisory disclosed
08/25/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 213
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-78654 (🔒)
GCVE (CVE): GCVE-0-2026-78654
GCVE (VulDB): GCVE-100-394866
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/25/2026 01:13
Changes: 08/25/2026 01:13 (62)
Complete: 🔍
Submitter: Classif1ed_mick
Cache ID: 216::103

Submitinfo

Accepted

Submit #886401: cleverbrush @cleverbrush/deep (npm) <=4.4.0 Prototype Pollution (by github.com)