GHSA-587p-w43q-4hjx · Severity: critical · Ecosystem: npm — query-parser-string is vulnerable to Prototype Pollution
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.
Conclusion & alert: CVE-2025-63704 is rated Moderate Risk (41.2/100): CVSS Critical severity, with low exploitation likelihood (EPSS 0.02%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-05-22 | 0.06% | 0.02% | -0.04% |
| 2 | 2026-05-13 | 0.02% | 0.06% | +0.04% |
| 3 | 2026-05-08 | — | 0.02% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
GHSA-587p-w43q-4hjx · Severity: critical · Ecosystem: npm — query-parser-string is vulnerable to Prototype Pollution
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||