Vulnerabilities in pkg:npm/mpregular

PACKAGE
Advisory Identifier: GHSA-xx4g-r65p-3qf2
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Advisory Summary

CVE-2025-57323 is a HIGH (CVSS 7.5) mpregular vulnerable to prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Mpregular libraries in the npm ecosystem. The issue involves mpregular vulnerable to prototype pollution. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/mpregular

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/mpregular. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-xx4g-r65p-3qf2 CVE-2025-57323 HIGH mpregular vulnerable to prototype pollution

CVE-2025-57323 at a Glance

CVE Identifier CVE-2025-57323
GHSA Identifier GHSA-xx4g-r65p-3qf2
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Mpregular
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2025-57323

To remediate this vulnerability, upgrade all affected Mpregular dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mpregular fixed: Latest secure release 
npm install mpregular@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls mpregular

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-57323, inspect your project dependencies using npm:

npm ls mpregular

Analyze the terminal output to locate any version of Mpregular in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls mpregular command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where 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. In Mpregular, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2025-57323 Affected Mpregular Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
mpregular
npm/mpregular
npm
≤ 0.2.0

References

NVD — CVE-2025-57323 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-57323
Mpregular Source Repository REPOSITORY
https://github.com/VulnSageAgent/PoCs/blob/main/JavaScript/prototype-pollution/mpregular%400.2.0/index.js
Mpregular Source Repository REPOSITORY
https://github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57323
Mpregular Source Repository REPOSITORY
https://github.com/regularjs/regular

Frequently Asked Questions

What is CVE-2025-57323?
CVE-2025-57323 is a security vulnerability in Mpregular involving mpregular vulnerable to prototype pollution under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Mpregular versions are affected?
Affected versions include releases prior to current release patches across affected packages: mpregular.
What version fixes CVE-2025-57323?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is mpregular affected?
Yes, mpregular is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2025-57323?
CVE-2025-57323 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2025-57323?
CVE-2025-57323 is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') (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.).
How can I check npm dependencies for CVE-2025-57323?
Run the dependency tree command: 'npm ls mpregular'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xx4g-r65p-3qf2",
  "modified" : "2025-09-25T19:28:53Z",
  "published" : "2025-09-24T21:30:37Z",
  "aliases" : [ "CVE-2025-57323" ],
  "summary" : "mpregular vulnerable to prototype pollution",
  "details" : "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" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mpregular"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.2.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-57323"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/VulnSageAgent/PoCs/blob/main/JavaScript/prototype-pollution/mpregular%400.2.0/index.js"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57323"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/regularjs/regular"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-25T19:28:53Z",
    "nvd_published_at" : "2025-09-24T20:15:32Z"
  }
}