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CVE-2026-25521— Locutus is vulnerable to Prototype Pollution

Quick assessment

Affected
locutusjs locutus
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.

Locutus是Locutus开源的一个JavaScript代码库。 Locutus 2.0.12版本至2.0.39之前版本存在安全漏洞，该漏洞源于用户输入检查不足，可能导致原型污染。

AI Predicted 5.3 Difficulty: Easy EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
locutusjs locutus >= 2.0.12, < 2.0.39 affected
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I. Basic Information for CVE-2026-25521

Vulnerability Information
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Vulnerability Title
Locutus is vulnerable to Prototype Pollution
Source: CVE Program / CVE List V5
Vulnerability Description
Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. In versions from 2.0.12 to before 2.0.39, a prototype pollution vulnerability exists in locutus. 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 String.prototype. This issue has been patched in version 2.0.39.
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
Locutus 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Locutus是Locutus开源的一个JavaScript代码库。 Locutus 2.0.12版本至2.0.39之前版本存在安全漏洞，该漏洞源于用户输入检查不足，可能导致原型污染。
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
locutusjs locutus >= 2.0.12, < 2.0.39 -

II. Public POCs for CVE-2026-25521

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III. Intelligence Information for CVE-2026-25521

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Vendor Advisories for CVE-2026-25521 (1)

IV. Related Vulnerabilities

Same product: locutus
Same vendor: locutusjs
Same weakness: CWE-1321

V. Comments for CVE-2026-25521

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