Vulnerability Description
parse-nested-form-data is a tiny node module for parsing FormData by name into objects and arrays. Prior to version 1.0.1, parseFormData() walks bracket and dot-notation FormData field names into nested objects without filtering reserved property keys. A single FormData field whose name begins with __proto__, or contains .__proto__. mid-path, causes the parser to traverse onto Object.prototype and assign properties there, polluting the prototype chain of every plain object in the running process. This issue has been patched in version 1.0.1.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/milamer/parse-nested-form-data/commit/527ad58eb486e32438f7198
- https://github.com/milamer/parse-nested-form-data/releases/tag/v1.0.1
- https://github.com/milamer/parse-nested-form-data/security/advisories/GHSA-xp7r-
- https://github.com/milamer/parse-nested-form-data/security/advisories/GHSA-xp7r-
FAQ
What is CVE-2026-45302?
CVE-2026-45302 is a vulnerability with a CVSS score of 8.2 (HIGH). parse-nested-form-data is a tiny node module for parsing FormData by name into objects and arrays. Prior to version 1.0.1, parseFormData() walks bracket and dot-notation FormData field names into nest...
How severe is CVE-2026-45302?
CVE-2026-45302 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45302?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.