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9.8
CVE-2025-63704: Query-Parser-String for NPM: Malicious Query Parameters Can Harm Your App
CVE-2025-63704
GHSA-587p-w43q-4hjx
Summary
The query-parser-string package for NPM doesn't properly check user input, which can cause unexpected behavior in your application. This can happen if you use user-supplied data in your application without proper validation. To stay safe, update to a newer version of the package or consider using an alternative solution.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| npm | – | query-string-parser | 1.0.0 |
Original title
query-parser-string is vulnerable to Prototype Pollution
Original description
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.
Vulnerability type
CWE-1321
Prototype Pollution
Published: 7 May 2026 · Updated: 23 May 2026 · First seen: 7 May 2026