CVE-2026-26021

CRITICAL EPSS 36.6%
Published Feb 11, 20264mo ago · Modified Jun 17, 20262w ago
9.4 CVSS 4.0
Critical
Find Similar
Published Feb 11, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
9.4
Exploitability
—
Impact
—
Vector string
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
Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
36.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-1321

Affected Products 1

VendorProductVersionRange
set-in_projectset-in*≥2.0.1  –  <2.0.5

References 2

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

Remediation

  • github.com https://github.com/ahdinosaur/set-in/commit/b8e1dabfdbd35c8d604b6324e01d03f280256c3d
    Patch