Critical Malicious Code Vulnerability in syntax-async-generators Package

syntax-async-generators Updated 18 Mar 2026

Summary

18/03/2026

Disclosed on

CRITICAL

Severity

No i

Fix available

Critical

Severity

Not published

CVSS Score

MAL-2026-1558: Malicious code in syntax-async-generators (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The syntax-async-generators package is an npm library designed to facilitate the use of asynchronous generators in JavaScript. It allows developers to write cleaner and more efficient asynchronous code. However, this package has been found to contain malicious code that compromises the security of any system where it is installed.

Vulnerability Detail

The vulnerability originates from the presence of embedded malicious code within the syntax-async-generators 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 ramifications of this vulnerability are severe, as it can lead to data breaches and loss of control over the affected systems. The malicious nature of the code is classified under CWE-506, indicating that it contains code that appears to be malicious in nature.

How To Fix

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

npm uninstall syntax-async-generators

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

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Workaround

There are no effective workarounds for this vulnerability other than removing the package entirely and ensuring that all sensitive information is secured.

Conclusion

The syntax-async-generators package contains malicious code that poses a significant security risk. Immediate action is required to remove the package and secure any sensitive information. Utilize tools like Vulert to monitor for vulnerabilities in your applications.

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