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.
Published: 2026-05-29
Score: 8.2 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-m2hg-wjq3-28wq form-data-objectizer: Prototype pollution in form-data-objectizer via bracket-notation form keys
History

Tue, 02 Jun 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 29 May 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Kaspernj
Kaspernj form-data-objectizer
Vendors & Products Kaspernj
Kaspernj form-data-objectizer

Fri, 29 May 2026 13:45:00 +0000

Type Values Removed Values Added
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.
Title Prototype pollution in form-data-objectizer via bracket-notation form keys
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L'}


Subscriptions

Kaspernj Form-data-objectizer
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-02T01:28:15.623Z

Reserved: 2026-05-14T19:12:32.754Z

Link: CVE-2026-46510

cve-icon Vulnrichment

Updated: 2026-06-02T01:14:58.863Z

cve-icon NVD

Status : Deferred

Published: 2026-05-29T14:16:31.807

Modified: 2026-06-02T03:16:17.990

Link: CVE-2026-46510

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-29T15:46:27Z

Weaknesses