CVE-2026-45302— Prototype Pollution in parse-nested-form-data via `__proto__` in FormData field names
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1321
Source: NVD (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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Patches & Fixes for CVE-2026-45302 (1)
Vendor Advisories for CVE-2026-45302 (1)
Other References for CVE-2026-45302 (1)
- 🔗 Release v1.0.1 · milamer/parse-nested-form-data · GitHubx_refsource_MISC
IV. Related Vulnerabilities
Same weakness: CWE-1321
- CVE-2026-46510
Prototype pollution in form-data-objectizer via bracket-nota - CVE-2026-46509
deepobj: Improperly Controlled Modification of Object Protot - CVE-2026-44483
RVF: Prototype pollution in @rvf/set-get reachable via @rvf/ - CVE-2026-44966
Velocity.js: Prototype Pollution in #set path assignment - CVE-2026-9101
Prototype pollution in csv parsing
V. Comments for CVE-2026-45302
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