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CVE-2026-6594— brikcss merge prototype pollution

Quick assessment

Affected
brikcss merge
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

merge是brikcss开源的一个递归合并 JavaScript 对象的工具。 merge 1.3.0及之前版本存在安全漏洞，该漏洞源于对参数__proto__/constructor.prototype/prototype的操作不当，可能导致对象原型属性被不当修改。

CVSS 7.3 · High EPSS 0.56% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-6594

Vulnerability Information
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Vulnerability Title
brikcss merge prototype pollution
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in brikcss merge up to 1.3.0. This affects an unknown part. Executing a manipulation of the argument __proto__/constructor.prototype/prototype can lead to improperly controlled modification of object prototype attributes. The attack may be performed from remote. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
merge 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
merge是brikcss开源的一个递归合并 JavaScript 对象的工具。 merge 1.3.0及之前版本存在安全漏洞，该漏洞源于对参数__proto__/constructor.prototype/prototype的操作不当，可能导致对象原型属性被不当修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
brikcss merge 1.0 -

II. Public POCs for CVE-2026-6594

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III. Intelligence Information for CVE-2026-6594

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Vendor Advisories for CVE-2026-6594 (2)

IV. Related Vulnerabilities

Same product: merge
Same weakness: CWE-1321

V. Comments for CVE-2026-6594

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