Malicious Code Detected in array-join-seperators Package - Security Alert

array-join-seperators Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-14862: Malicious code in array-join-seperators (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The array-join-seperators package is an npm library designed to facilitate the joining of array elements with specified separators. It is commonly used in JavaScript applications to enhance string manipulation capabilities. However, this package has been identified to contain malicious code, posing significant security risks to applications that utilize it.

Vulnerability Detail

The vulnerability stems from the presence of malicious code within the array-join-seperators package. This code can potentially compromise the integrity of applications that depend on this library, leading to unauthorized access, data breaches, or other malicious activities. The issue was introduced in version 0 of the package and remains unaddressed in subsequent releases, making it critical for users to take immediate action.

How To Fix

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

npm uninstall array-join-seperators

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 security risks. Always ensure to review the security status of any package before integrating it into your project.

Conclusion

The discovery of malicious code in the array-join-seperators package highlights the importance of vigilance in managing dependencies. Users are urged to take immediate action to protect their applications from potential threats. Utilizing tools like Vulert can aid in monitoring and identifying vulnerabilities in real-time.

See every vulnerability recorded for array-join-seperators →

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FAQ

It is an npm library used for joining array elements with specified separators in JavaScript applications.

The specific nature of the malicious code has not been disclosed, but it poses significant security risks to applications using the package.

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 array-join-seperators package and consider using alternative libraries until a secure version is released.

As of now, there is no patched version available. Users should monitor updates from the package maintainers for any future fixes.

How To Fix

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

npm uninstall array-join-seperators

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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