CVE-2026-26021
Critical
Description
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.
SeverityCritical
CVSS9.8
Exploit probability—
ProductSet-in
PublishedFeb 11, 2026
First seenFeb 11, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- set-in_project set-in2.0.5 or later
- set-in2.0.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| set-in_project set-in | 2.0.1 ≤ v < 2.0.5 | 2.0.5 |
| set-innpm | 2.0.1 ≤ v < 2.0.5 | 2.0.5 |
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