CVE-2026-26021

CRITICAL

9.8

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.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/11/2026

Last Modified2/13/2026

Sourcenvd

Honeypot Sightings0

Affected Products

set-in_project:set-in

Weaknesses (CWE)

CWE-1321

References

https://github.com/ahdinosaur/set-in/commit/b8e1dabfdbd35c8d604b6324e01d03f280256c3d(security-advisories@github.com)

https://github.com/ahdinosaur/set-in/security/advisories/GHSA-2c4m-g7rx-63q7(security-advisories@github.com)

IOC Correlations

No correlations recorded

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