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CVE-2026-46510— Prototype pollution in form-data-objectizer via bracket-notation form keys

Quick assessment

Affected
kaspernj form-data-objectizer
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

form-data-objectizer是Kasper Stöckel个人开发者的一个表单数据转对象工具。 form-data-objectizer 1.0.1之前版本存在安全漏洞，该漏洞源于处理括号表示法表单键时未过滤__proto__、constructor或prototype，可能导致原型污染。

CVSS 8.2 · High EPSS 0.28% · P21

Affected Version Matrix 1

VendorProduct Version RangeStatus
kaspernj form-data-objectizer < 1.0.1 affected
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I. Basic Information for CVE-2026-46510

Vulnerability Information
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Vulnerability Title
Prototype pollution in form-data-objectizer via bracket-notation form keys
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
form-data-objectizer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
form-data-objectizer是Kasper Stöckel个人开发者的一个表单数据转对象工具。 form-data-objectizer 1.0.1之前版本存在安全漏洞，该漏洞源于处理括号表示法表单键时未过滤__proto__、constructor或prototype，可能导致原型污染。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kaspernj form-data-objectizer < 1.0.1 -

II. Public POCs for CVE-2026-46510

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9186 chars
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III. Intelligence Information for CVE-2026-46510

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Patches & Fixes for CVE-2026-46510 (1)

Vendor Advisories for CVE-2026-46510 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321