Critical Malicious Code Vulnerability in byrons Package

byrons Updated 02 Oct 2025

Summary

14/08/2025
CRITICAL
No i
Critical
Not published

MAL-2025-16398: Malicious code in byrons (npm). Affected versions are not published. No fix is published. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats
SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml
Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile
Javascript package-lock.json · yarn.lock · pnpm-lock.yaml
PHP composer.lock
Python poetry.lock · requirements.txt · Pipfile.lock
Go go.mod
Rust Cargo.lock
Ruby Gemfile.lock
Dart pubspec.lock
C/C++ conan.lock
Elixir mix.lock
Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Sponsored Lume, the Habilume companion Habilume Habit tracker with a companion that grows with you Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent. App Store Google Play

Background

The byrons package is an npm library designed for various functionalities within JavaScript applications. It is often utilized for its ease of integration and performance efficiency. However, recent findings have revealed that this package contains malicious code, posing significant security risks to applications that depend on it.

Vulnerability Detail

The vulnerability originates from the inclusion of malicious code within the byrons package, which was introduced in version 0 and affects all subsequent versions. This malicious code can lead to unauthorized access, data breaches, and potential exploitation of the systems using this package. Developers using byrons should be aware of the severe implications this vulnerability may have on their applications and user data.

How To Fix

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

npm uninstall byrons

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

As a temporary workaround, you can replace the byrons package with an alternative library that offers similar functionality without the associated risks. Ensure to thoroughly review the alternative's security history before implementation.

Conclusion

The discovery of malicious code within the byrons package poses a significant threat to applications relying on it. Immediate action is required to mitigate risks, including removing the package and seeking alternatives. Utilizing tools like Vulert can enhance your security posture by providing real-time vulnerability alerts.

See every vulnerability recorded for byrons →

Share this vulnerability

FAQ

Byrons is an npm package used in JavaScript applications for various functionalities, but it has been found to contain malicious code.

You can use Vulert to monitor and alert for vulnerabilities in your application. By utilizing the Vulert playground, you can check if your application is affected by this vulnerability without any signup.

If you are using byrons, it is recommended to remove the package immediately and look for a secure alternative.

Currently, there is no patch available for the byrons package. It is advised to remove the package until a secure version is released.

Vulert uses your package-lock.json file to monitor and alert in real-time for open-source vulnerabilities, ensuring your application remains secure.

Sponsored Lume, the Habilume companion Habilume Habit tracker with a companion that grows with you Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent. App Store Google Play

How To Fix

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

npm uninstall byrons

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 →

Subscribe to Vulert on Telegram
Daily digest of new CVEs, critical and high severity, affected packages and fixes — plus a weekly roundup.
Join the channel →
Help improve this record
Report an issue or send feedback