form-data-objectizer: Prototype pollution in form-data-objectizer via bracket-notation form keys

Description

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.

Recommendation

Update the form-data-objectizer package to the latest compatible version. Followings are version details:

• Affected version(s): <= 1.0.0
• Patched version(s): 1.0.1

References

• GHSA-m2hg-wjq3-28wq
• CVE-2026-46510
• CWE-1321
• CAPEC-310
• OWASP 2021-A6

Related Issues

• @rvf/set-get has a prototype pollution issue that's reachable via @rvf/core preprocessFormData (HTTP form data) - CVE-2026-44483
• scimPatch vulnerable to prototype pollution via unfiltered keys in patch - CVE-2026-48170
• Axios has a Patch Bypass: Proxy-Authorization Header Injection via Prototype Pollution — Incomplete Null-Prototype Fix - CVE-2026-44489
• Axios: XSRF Token Cross-Origin Leakage via Prototype Pollution Gadget in `withXSRFToken` Boolean Coercion - CVE-2026-42042

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10 Secure Coding Best Practices to Follow in Every Project

Tags:

npm

form-data-objectizer