Critical Malicious Code Vulnerability in @vleo-dev/a11y-js-service Package
Summary
MAL-2025-191459: Malicious code in @vleo-dev/a11y-js-service (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The @vleo-dev/a11y-js-service package is an npm library designed to enhance accessibility features in web applications. It aims to provide developers with tools to ensure their applications are compliant with accessibility standards. However, this package has been compromised, embedding malicious code that poses significant security risks to any system using it.
Vulnerability Detail
The vulnerability stems from the presence of malicious code within the @vleo-dev/a11y-js-service 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 malicious nature of the code is classified under CWE-506, indicating that it contains embedded malicious code. Users are advised to treat any system running this package as potentially compromised.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall @vleo-dev/a11y-js-serviceIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
Currently, there are no workarounds to mitigate the risks posed by this vulnerability other than removing the package entirely. Ensure to monitor your systems for any signs of compromise after removal.
Conclusion
The @vleo-dev/a11y-js-service package has been identified as containing malicious code that can compromise systems. Immediate action is required to remove the package and secure any sensitive information. Users are encouraged to utilize tools like Vulert for ongoing monitoring of vulnerabilities in their applications.
See every vulnerability recorded for @vleo-dev/a11y-js-service →
FAQ
You should immediately uninstall the package and rotate any sensitive information stored on the affected system.
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No, there is currently no patched version available. The only solution is to remove the package.
Failing to remove the package can lead to unauthorized access to sensitive data and complete control of the affected system by malicious actors.
After removal, rotate all secrets and keys stored on the affected system and monitor for any unusual activity.
