CVE-2026-46510

HIGH

Prototype pollution in form-data-objectizer via bracket-notation form keys

Title source: cna
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 8.2
EPSS 0.0028
EPSS Percentile 19.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-1321
Status published
Products (2)
kaspernj/form-data-objectizer < 1.0.1
npm/form-data-objectizer 0 - 1.0.1npm
Published May 29, 2026
Tracked Since May 29, 2026