Malicious Code Detected in cuffer-xor Package - Immediate Action Required

cuffer-xor Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-17821: Malicious code in cuffer-xor (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The cuffer-xor package is an npm library designed for XOR encryption and decryption. It is utilized in various JavaScript applications for secure data handling. However, this package has been identified to contain malicious code, posing significant risks to applications that depend on it.

Vulnerability Detail

The vulnerability in the cuffer-xor package originates from the inclusion of malicious code that can compromise the security of applications using this library. This code can lead to unauthorized access, data breaches, or even complete system takeover. The malicious nature of this vulnerability was confirmed by security researchers, highlighting the need for immediate remediation.

How To Fix

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

npm uninstall cuffer-xor

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 removing the cuffer-xor package from your project until a secure version is released. You can do this by executing the command: 'npm uninstall cuffer-xor'. This will prevent any potential exploitation of the vulnerability while you seek alternatives.

Conclusion

The cuffer-xor package has been found to contain malicious code, posing serious security risks to applications that utilize it. Immediate action is required to update or remove the package to protect your software from potential exploitation. Regular monitoring of dependencies is essential to maintain security.

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FAQ

The cuffer-xor package is used for XOR encryption and decryption in JavaScript applications, providing a method for secure data handling.

The malicious code was identified by security researchers during routine checks and was reported through the Amazon Inspector.

Using the compromised package can lead to unauthorized access to sensitive data, data breaches, and potential system takeovers.

Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using just the package-lock.json file. You can check your application for vulnerabilities without any signup using the Vulert playground.

If immediate updates are not possible, consider removing the package from your project as a temporary measure until a secure version is available.

Related vulnerabilities

Recent vulnerabilities recorded for cuffer-xor.

How To Fix

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

npm uninstall cuffer-xor

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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