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CVE-2026-45302— Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names

Quick assessment

Affected
milamer parse-nested-form-data
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.

parse-nested-form-data是Christian Schurr个人开发者的一个表单数据解析工具。 parse-nested-form-data 1.0.1之前版本存在安全漏洞，该漏洞源于parseFormData()在解析括号和点符号FormData字段名时未过滤保留属性键，可能导致原型污染。

CVSS 8.2 · High EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
milamer parse-nested-form-data < 1.0.1 affected
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I. Basic Information for CVE-2026-45302

Vulnerability Information
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Vulnerability Title
Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names
Source: CVE Program / CVE List V5
Vulnerability Description
parse-nested-form-data is a tiny node module for parsing FormData by name into objects and arrays. Prior to version 1.0.1, parseFormData() walks bracket and dot-notation FormData field names into nested objects without filtering reserved property keys. A single FormData field whose name begins with __proto__, or contains .__proto__. mid-path, causes the parser to traverse onto Object.prototype and assign properties there, polluting the prototype chain of every plain object in the running process. This issue has been patched in version 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
parse-nested-form-data 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
parse-nested-form-data是Christian Schurr个人开发者的一个表单数据解析工具。 parse-nested-form-data 1.0.1之前版本存在安全漏洞，该漏洞源于parseFormData()在解析括号和点符号FormData字段名时未过滤保留属性键，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
milamer parse-nested-form-data < 1.0.1 -

II. Public POCs for CVE-2026-45302

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7560 chars
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III. Intelligence Information for CVE-2026-45302

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Patches & Fixes for CVE-2026-45302 (1)

Vendor Advisories for CVE-2026-45302 (1)

Other References for CVE-2026-45302 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1321