CVE-2026-46510
High
Description
form-data-objectizer converts FormData to object. Prior to 1.0.1, form-data-objectizer walks bracket-notation form keys (e.g. name[sub]) into nested objects without filtering __proto__, constructor, or prototype. A single HTTP form field whose name starts with __proto__[...] causes the library to mutate Object.prototype, which is a prototype pollution primitive of the entire Node.js process. This vulnerability is fixed in 1.0.1.
SeverityHigh
CVSS8.2
Exploit probability—
ProductForm-data-objectizer
PublishedMay 29, 2026
First seenMay 29, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- form-data-objectizer1.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| form-data-objectizernpm | v < 1.0.1 | 1.0.1 |
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