CVE-2026-46510
Prototype pollution in form-data-objectizer via bracket-notation form keys
CVSS Score
8.2
EPSS Score
0.0%
EPSS Percentile
13th
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.
| CWE | CWE-1321 |
| Vendor | kaspernj |
| Product | form-data-objectizer |
| Published | May 29, 2026 |
| Last Updated | Jun 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
Low
Affected Versions
kaspernj / form-data-objectizer
< 1.0.1