CVE-2026-45302
CVE-2026-45302 · Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 8.2 · High · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
parse-nested-form-data
- Versions
- < 1.0.1: Affected
No fix published
parse-nested-form-data npm
- Affected ranges
- SEMVER: < 1.0.1
Update to 1.0.1
Original sources
- https://github.com/milamer/parse-nested-form-data/security/advisories/GHSA-xp7r-j8r6-j9h3
- https://github.com/milamer/parse-nested-form-data/commit/527ad58eb486e32438f7198fb88315c20449d792
- https://github.com/milamer/parse-nested-form-data/releases/tag/v1.0.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-45302