CVE-2026-45302
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk24th percentile - higher than 24% of all known CVEs
Summary
Vulnerability in the Node.js library parse-nested-form-data before version 1.0.1. The parseFormData() function does not filter reserved property keys when processing FormData field names, allowing prototype pollution of Object.prototype via a field name starting with __proto__ or containing .__proto__.
Risk Assessment
An attacker can pollute the prototype chain of all plain objects in the process, potentially leading to remote code execution or other attacks.
Recommendation
Update the parse-nested-form-data library to version 1.0.1 or later.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

