Critical Malicious Code Vulnerability in chai-iotype Package

chai-iotype Updated 24 Feb 2026

Summary

24/02/2026
CRITICAL
No i
Critical
Not published

MAL-2026-1014: Malicious code in chai-iotype (npm). Affected versions are not published. No fix is published. How to fix ↓

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Background

The chai-iotype package is a utility library in the npm ecosystem that provides type-checking functionalities for JavaScript applications. It is widely used for validating data types and ensuring that the data passed through functions adheres to expected formats. However, this package has been identified to contain malicious code, posing significant security risks to any system where it is installed.

Vulnerability Detail

The vulnerability originates from the presence of embedded malicious code within the chai-iotype package. This code can 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 full system compromise, data breaches, and potential exploitation by malicious actors. Users are advised to treat any system with this package as fully compromised.

How To Fix

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

npm uninstall chai-iotype

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. Users should ensure that their applications do not rely on the chai-iotype package and seek alternative libraries for type-checking functionalities.

Conclusion

The discovery of malicious code within the chai-iotype package poses a significant threat to users and their systems. Immediate action is required to remove the package and secure any sensitive information. Users should remain vigilant and consider alternative solutions for their type-checking needs.

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FAQ

You should immediately uninstall the chai-iotype package and rotate any sensitive information stored on the affected system.

You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.

No, there is currently no patched version available for the chai-iotype package. The only solution is to remove it.

Failing to remove the package can lead to unauthorized access to your system, data breaches, and potential exploitation by attackers.

It is highly discouraged to use chai-iotype due to its malicious nature. Seek alternative libraries for type-checking.

How To Fix

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

npm uninstall chai-iotype

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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