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CVE-2026-26021— Prototype pollution in set-in

Quick assessment

Affected
ahdinosaur set-in
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

set-in是Mikey个人开发者的一个JavaScript库。 set-in 2.0.1至2.0.5之前版本存在安全漏洞，该漏洞源于对用户输入检查不足，可能导致通过特制输入污染Object.prototype的原型污染攻击。

AI Predicted 5.6 Difficulty: Easy EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-26021

Vulnerability Information
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Vulnerability Title
Prototype pollution in set-in
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
set-in 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
set-in是Mikey个人开发者的一个JavaScript库。 set-in 2.0.1至2.0.5之前版本存在安全漏洞，该漏洞源于对用户输入检查不足，可能导致通过特制输入污染Object.prototype的原型污染攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ahdinosaur set-in >= 2.0.1, < 2.0.5 -

II. Public POCs for CVE-2026-26021

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III. Intelligence Information for CVE-2026-26021

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Vendor Advisories for CVE-2026-26021 (1)

IV. Related Vulnerabilities

Same product: set-in
Same weakness: CWE-1321

V. Comments for CVE-2026-26021

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