Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Set-In Project | Set-In | >= 2.0.1, < 2.0.5 |
Related Weaknesses (CWE)
References
- https://github.com/ahdinosaur/set-in/commit/b8e1dabfdbd35c8d604b6324e01d03f28025Patch
- https://github.com/ahdinosaur/set-in/security/advisories/GHSA-2c4m-g7rx-63q7ExploitVendor Advisory
FAQ
What is CVE-2026-26021?
CVE-2026-26021 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 t...
How severe is CVE-2026-26021?
CVE-2026-26021 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-26021?
Check the references section above for vendor advisories and patch information. Affected products include: Set-In Project Set-In.