Critical Malicious Code Vulnerability in @flexmr/utils Package
Summary
MAL-2026-17888: Malicious code in @flexmr/utils (npm). Affects @flexmr/utils versions 1.0.0 – 3.0.12. No fix is published. How to fix ↓
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Background
The @flexmr/utils package is a utility library designed for use in JavaScript applications, providing various helper functions. However, version 3.0.12 of this package has been identified as containing malicious code that poses significant security risks to users. The package's dependency management is flawed, allowing unverified code to be executed during installation.
Vulnerability Detail
The vulnerability originates from the @flexmr/utils package version 3.0.12, which includes a re-export stub that fetches a dependency from a non-registry host. This dependency, 'daemon-thread-lookup-buffer', is unpinned and lacks an integrity hash, meaning that any code returned from the specified URL can be executed. This allows the operator of the external host to execute arbitrary code on the installer's machine, leading to potential data breaches or system compromise.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall @flexmr/utilsIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a temporary workaround, avoid using the @flexmr/utils package until a secure version is released. If you must use it, consider isolating the installation in a controlled environment to mitigate risks.
Conclusion
The @flexmr/utils package version 3.0.12 contains a critical vulnerability that allows for the execution of malicious code from an untrusted source. Users are advised to update to a secure version as soon as possible and to consider using tools like Vulert for ongoing monitoring of vulnerabilities in their applications.
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FAQ
The vulnerability allows malicious code execution from an untrusted source during the installation of the package.
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Check the package's repository for any updates or patches. If a patched version is available, update using npm install @flexmr/utils@latest.
As a workaround, avoid using the package or isolate its installation in a controlled environment to reduce risk.
Exploitation of this vulnerability can lead to unauthorized code execution, data breaches, and potential system compromise.
