What is CVE-2026-46510?

CVE-2026-46510 is a high-severity vulnerability in Kaspernj Form-data-objectizer, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.2/10. Published 2026-05-29.

How severe is CVE-2026-46510?

High severity. CVSS v3 base score is 8.2 out of 10.

Prototype Pollution in Kaspernj Form-data-objectizer

CVE-2026-46510

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 w…

Vulnerability class: Prototype Pollution

EPSS: 0.001 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L.

Affected products

Kaspernj Form-data-objectizer — versions < 1.0.1

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-46510?: CVE-2026-46510 is a high-severity vulnerability in Kaspernj Form-data-objectizer, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 8.2/10. Published 2026-05-29.
How severe is CVE-2026-46510?: High severity. CVSS v3 base score is 8.2 out of 10.