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CVE-2025-57323

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Date: September 23, 2025

mpregular is a package that provides a small program development framework based on RegularJS. A Prototype Pollution vulnerability in the mp.addEventHandler function of mpregular version 0.2.0 and before allows attackers to inject properties on Object.prototype via supplying a crafted payload, causing denial of service (DoS) as the minimum consequence.

Severity Score

Related Resources (5)

https://github.com/regularjs/regular
https://github.com/VulnSageAgent/PoCs/blob/main/JavaScript/prototype-pollution/mpregular%400.2.0/index.js
https://nvd.nist.gov/vuln/detail/CVE-2025-57323
https://github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57323
https://www.mend.io/vulnerability-database/CVE-2025-57323

Severity Score

Weakness Type (CWE)

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

CWE-1321

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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