Malicious Code Detected in atbash Package - Security Alert

atbash Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-15001: Malicious code in atbash (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The atbash package is an npm library designed for various functionalities, including encoding and decoding messages using the Atbash cipher technique. It is widely used in applications requiring simple encryption methods. However, recent findings have revealed that the package contains malicious code, posing significant security risks to users and their applications.

Vulnerability Detail

The vulnerability in the atbash package stems from the inclusion of malicious code that can compromise the security of applications utilizing this library. This code may lead to unauthorized access, data breaches, or other harmful actions within the affected systems. The issue was introduced in version 0 and affects all subsequent versions, making it critical for users to take immediate action to mitigate potential risks.

How To Fix

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

npm uninstall atbash

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

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Workaround

As a temporary workaround, users can remove the atbash package from their project until a secure version is released. This can be done using the command: 'npm uninstall atbash'. Alternatively, consider using a different package that provides similar functionality without the associated risks.

Conclusion

The atbash package has been identified as containing malicious code, posing serious security risks to applications that utilize it. Users are advised to take immediate action by updating or removing the package to safeguard their systems. Regular monitoring for updates and vulnerabilities is essential.

See every vulnerability recorded for atbash →

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FAQ

The atbash package is an npm library used for encoding and decoding messages using the Atbash cipher.

The malicious code can lead to unauthorized access and potential data breaches in applications using the atbash package.

You can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time. Check your application using the Vulert playground at Vulert Scanner.

As a temporary measure, consider uninstalling the atbash package or using an alternative package until a secure version is available.

Currently, there is no specific patched version mentioned, but users should regularly check the package repository for updates.

How To Fix

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

npm uninstall atbash

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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