AUGUST 4, 2026
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Case File

CVE-2026-26021

CRITICAL · CVSS 9.8 EPSS 0.46% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2026-02-11 · Last synced 2026-08-04

CyberRota Analysis

This is a critical severity vulnerability with a CVSS score of 9.8. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-26021
Severity
CRITICAL
CVSS
9.8
EPSS
0.46%

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)