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CVE PROGRAM SOURCE RECORD8.2 High

CVE-2026-45302

Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

milamer parse-nested-form-data

  • < 1.0.1affected

References