Cloudanix VulnDB

CVE-2026-26021

Critical · 9.8

CVSS

9.8

EPSS

0.6%

Published

Feb 11, 2026

CISA due date

—

The record

set-in provides the set value of nested associative structure given array of keys. A prototype pollution vulnerability exists in the the npm package set-in (>=2.0.1, < 2.0.5). Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using Array.prototype. This has been fixed in version 2.0.5.

Affected packages

Ecosystem Package Introduced Fixed
npm set-in 2.0.1 2.0.5

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