CVE-2026-26021

critical · 9.4

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.

9.4

CVSS

0.5%

EPSS (exploit prob.)

42nd

EPSS percentile

2026-02-11

Published

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-1321

Affected products

Vendor	Product	Affected versions
set-in_project	set-in	>= 2.0.1, < 2.0.5

Check a specific version with /api/v1/cve/match.

References

https://github.com/ahdinosaur/set-in/commit/b8e1dabfdbd35c8d604b6324e01d03f280256c3d
https://github.com/ahdinosaur/set-in/security/advisories/GHSA-2c4m-g7rx-63q7

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-26021