Vulnerability Details CVE-2026-26021
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.7%
CVSS Severity
CVSS v3 Score 9.8
References
Products affected by CVE-2026-26021
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cpe:2.3:a:set-in_project:set-in:2.0.1
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cpe:2.3:a:set-in_project:set-in:2.0.2