CVE-2026-46510 — Prototype pollution in form-data-objectizer via bracket-notation form keys
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 __…
Published: 2026-05-29 · CVSS: 8.2 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7