Critical Malicious Code Vulnerability in transform-react-jsx Package

transform-react-jsx Updated 18 Mar 2026

Summary

18/03/2026
CRITICAL
No i
Critical
Not published

MAL-2026-1508: Malicious code in transform-react-jsx (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The transform-react-jsx package is a tool used in JavaScript applications to transform JSX syntax into JavaScript function calls. It is commonly utilized in React applications to facilitate the use of JSX, which allows developers to write HTML-like syntax directly within JavaScript. However, this package has been compromised, leading to a significant security vulnerability that can fully compromise any system where it is installed.

Vulnerability Detail

The vulnerability stems from the presence of malicious code within the transform-react-jsx package. This code can grant unauthorized access to the system, potentially allowing attackers to steal sensitive information such as secrets and keys. The malicious nature of the code means that any computer running this package should be considered fully compromised, and the implications can be severe, including data breaches and loss of control over the affected system.

How To Fix

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

npm uninstall transform-react-jsx

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

There are no effective workarounds for this vulnerability other than removing the package and rotating all secrets and keys stored on the compromised system. It is recommended to perform these actions from a different, secure computer.

Conclusion

The transform-react-jsx package has been compromised with malicious code, posing a severe risk to any system where it is installed. Immediate action is required to remove the package and secure any sensitive information. Users are encouraged to utilize tools like Vulert to monitor for vulnerabilities in their applications.

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FAQ

Immediately remove the transform-react-jsx package and rotate any secrets or keys stored on your system.

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

Failing to address this vulnerability can lead to unauthorized access to sensitive information and complete compromise of your system.

After removing the package, it is essential to rotate all secrets and keys. However, there is no guarantee that all malicious software will be removed.

It is advisable to avoid using the transform-react-jsx package until a thorough investigation and confirmation of its safety are provided.

How To Fix

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

npm uninstall transform-react-jsx

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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