CVE-2025-63704: Query string parser Query-parser-string Is Vulnerable To Prototype Vulnerability

CRITICAL
Advisory Identifier: GHSA-587p-w43q-4hjx
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CVSS 9.8
CWE-1321
Published
Advisory Summary

CVE-2025-63704 is a CRITICAL (CVSS 9.8) query-parser-string is vulnerable to prototype vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Query string parser libraries in the npm ecosystem. The issue involves query-parser-string is vulnerable to prototype pollution. Remediation is available in the latest vendor maintenance releases.

CVE-2025-63704 at a Glance

CVE Identifier CVE-2025-63704
GHSA Identifier GHSA-587p-w43q-4hjx
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Query string parser
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2025-63704

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

query-string-parser fixed: Latest secure release 
npm install query-string-parser@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 query-string-parser

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-63704, inspect your project dependencies using npm:

npm ls query-string-parser

Analyze the terminal output to locate any version of Query string parser 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 query-string-parser 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 Query string parser, 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

NPM package query-parser-string 1.0.0 is vulnerable to Prototype Pollution. The package does not properly sanitize user supplied query parameters and merges them to the newly created object.

CVE-2025-63704 Affected Query string parser Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
query-string-parser
npm/query-string-parser
npm
1.0.0
All 1 versions
1.0.0
None specified

References

NVD — CVE-2025-63704 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-63704
Query string parser Source Repository REPOSITORY
https://github.com/victorteokw/query-string-parser/issues/3
Query string parser Source Repository REPOSITORY
https://gist.github.com/6en6ar/d62f614dbb2b1032b5e45a56fe26ec8b
Query string parser Source Repository REPOSITORY
https://github.com/victorteokw/query-string-parser
www.npmjs.com/package/query-strin... WEB
https://www.npmjs.com/package/query-string-parser?activeTab=readme

Frequently Asked Questions

What is CVE-2025-63704?
CVE-2025-63704 is a security vulnerability in Query string parser involving query-parser-string is vulnerable to Prototype Pollution under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Query string parser versions are affected?
Affected versions include releases prior to current release patches across affected packages: query-string-parser.
What version fixes CVE-2025-63704?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is query-string-parser affected?
Yes, query-string-parser 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-2025-63704?
CVE-2025-63704 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2025-63704?
CVE-2025-63704 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-2025-63704?
Run the dependency tree command: 'npm ls query-string-parser'. 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-587p-w43q-4hjx",
  "modified" : "2026-05-12T16:19:25Z",
  "published" : "2026-05-07T18:30:40Z",
  "aliases" : [ "CVE-2025-63704" ],
  "summary" : "query-parser-string is vulnerable to Prototype Pollution",
  "details" : "NPM package query-parser-string 1.0.0 is vulnerable to Prototype Pollution. The package does not properly sanitize user supplied query parameters and merges them to the newly created object.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "query-string-parser"
    },
    "versions" : [ "1.0.0" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-63704"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/victorteokw/query-string-parser/issues/3"
  }, {
    "type" : "WEB",
    "url" : "https://gist.github.com/6en6ar/d62f614dbb2b1032b5e45a56fe26ec8b"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/victorteokw/query-string-parser"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/query-string-parser?activeTab=readme"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-12T16:19:25Z",
    "nvd_published_at" : "2026-05-07T16:16:17Z"
  }
}