Critical Malicious Code Vulnerability in btyr5 Package

btyr5 Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-16244: Malicious code in btyr5 (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The btyr5 package is a Node.js library designed for various utility functions within JavaScript applications. It is commonly used for its lightweight nature and ease of integration into projects. However, recent findings have revealed that this package contains malicious code, posing significant risks to applications that utilize it.

Vulnerability Detail

The vulnerability in the btyr5 package originates from the inclusion of malicious code that can compromise the security of applications using it. This code may allow unauthorized access to sensitive data, execute arbitrary commands, or facilitate further attacks on the system. The implications of this vulnerability are severe, as it can lead to data breaches, loss of integrity, and potential exploitation of the affected systems.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall btyr5

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

As a temporary workaround, consider using alternative packages that provide similar functionality without the associated risks. Always ensure to review the package's security history before integrating it into your project.

Conclusion

The discovery of malicious code in the btyr5 package highlights the importance of regularly auditing dependencies in software projects. Developers should take immediate action to remove the affected package and consider alternatives to safeguard their applications.

See every vulnerability recorded for btyr5 →

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FAQ

btyr5 is a Node.js library used for various utility functions in JavaScript applications.

The malicious code can compromise application security, allowing unauthorized access and potential data breaches.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Visit Vulert Scanner to check your application without needing to sign up.

Immediately uninstall the btyr5 package and consider using alternative packages until a secure version is released.

Currently, there is no patched version available. It is recommended to remove the package until further notice.

How To Fix

This package is malicious. Remove it and rotate any credentials it could have accessed.

npm uninstall btyr5

If it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

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