CVE-2026-26021
CRITICAL
GHSA-2c4m-g7rx-63q7
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4Description
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.
Analysis
Prototype pollution in set-in npm package allows modification of Object prototype. PoC and patch available.
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Remediation
Within 24 hours: Inventory all systems running Set-In and assess exposure; disable Set-In in non-production environments if patching will take longer. Within 7 days: Apply the available vendor patch to all production systems following change management procedures; validate patch deployment. …
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External POC / Exploit Code
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