CVE-2025-63704: query-parser-string is vulnerable to Prototype Pollution

May 7, 2026 (updated May 12, 2026)

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.

References

gist.github.com/6en6ar/d62f614dbb2b1032b5e45a56fe26ec8b
github.com/advisories/GHSA-587p-w43q-4hjx
github.com/victorteokw/query-string-parser/issues/3
nvd.nist.gov/vuln/detail/CVE-2025-63704
www.npmjs.com/package/query-string-parser?activeTab=readme

Code Behaviors & Features

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