What is CVE-2025-63704?

CVE-2025-63704 is a critical-severity vulnerability in N/a, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2026-05-07.

How severe is CVE-2025-63704?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Prototype Pollution in N/a

CVE-2025-63704

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 class: Prototype Pollution

EPSS: 0.000 (5.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

N/a — versions n/a

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

cve@mitre.org
cve@mitre.org
cve@mitre.org

Frequently asked questions

What is CVE-2025-63704?: CVE-2025-63704 is a critical-severity vulnerability in N/a, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2026-05-07.
How severe is CVE-2025-63704?: Critical severity. CVSS v3 base score is 9.8 out of 10.