Object Prototype Modification Vulnerability in brikcss Merge by Brikcss
CVE-2026-6594

6.9MEDIUM

Key Information:

Vendor

Brikcss

Status
Merge
Vendor
CVE Published:
20 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6594?

A prototype pollution vulnerability was identified in brikcss Merge versions up to 1.3.0, allowing attackers to manipulate the argument proto/constructor.prototype/prototype. This can result in unauthorized modifications to object prototype attributes, leading to potential security risks. The issue can be exploited remotely, emphasizing the need for immediate attention to mitigate potential impacts on affected systems. Despite early notification of the vulnerability to the vendor, there has been no response.

Affected Version(s)

merge 1.0

merge 1.1

merge 1.2

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-2026-6594 - Proof of Concept

References

https://vuldb.com/vuln/358229
vdb-entrytechnical-description
https://vuldb.com/vuln/358229/cti
signaturepermissions-required
https://vuldb.com/submit/791805
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

sudosme (VulDB User)
VulDB CNA Team
.