Critical Malicious Code Vulnerability in @asyncapi/java-template Package

@asyncapi/java-template Updated 24 Nov 2025

Summary

24/11/2025
CRITICAL
No i
Critical
Not published

MAL-2025-190717: Malicious code in @asyncapi/java-template (npm). Affects @asyncapi/java-template versions 0.3.5 – 0.3.6. No fix is published. How to fix ↓

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Background

The @asyncapi/java-template package is a tool designed for generating Java code from AsyncAPI specifications. It is widely used in the development of applications that utilize asynchronous messaging protocols. However, this package has been compromised, leading to significant security concerns for users who have it installed.

Vulnerability Detail

The vulnerability originates from malicious code embedded within the @asyncapi/java-template package. This code can fully compromise any computer that has the package installed, allowing unauthorized access to sensitive information such as secrets and keys. The malicious nature of this code poses a severe risk, as it may lead to data breaches and unauthorized control over affected systems.

How To Fix

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

npm uninstall @asyncapi/java-template

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

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Workaround

As a workaround, users should ensure that they do not run any applications that depend on the @asyncapi/java-template package until it has been removed and the system has been secured. Regularly monitor your environment for any signs of compromise.

Conclusion

The @asyncapi/java-template package has been compromised with malicious code, posing a significant security risk to users. Immediate action is required to remove the package and secure any sensitive information. Utilizing tools like Vulert can help monitor for such vulnerabilities in the future.

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FAQ

Immediately uninstall the package using 'npm uninstall @asyncapi/java-template' and rotate any sensitive information stored on the affected machine.

You can use Vulert's playground at Vulert Scanner to check if your application is affected without needing to sign up.

Failing to remove the package could result in unauthorized access to your system, leading to potential data breaches and loss of sensitive information.

Regularly monitor your dependencies for vulnerabilities using tools like Vulert, which can alert you to issues in real-time.

Consider looking for alternative packages that offer similar functionality without the associated risks, or wait for an official fix from the maintainers.

How To Fix

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

npm uninstall @asyncapi/java-template

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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