Critical Malicious Code Vulnerability in blocks-builder-manifest-generator Package
Summary
MAL-2026-385: Malicious code in blocks-builder-manifest-generator (npm). Affected versions are not published. No fix is published. How to fix ↓
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.
No signup required · Results in about 60 seconds
Background
The blocks-builder-manifest-generator is an npm package designed to facilitate the generation of manifest files for block builders. It is commonly used in web development projects to streamline the management of block components. However, this package has been compromised, leading to significant security concerns for users who have it installed.
Vulnerability Detail
This vulnerability stems from the presence of malicious code embedded within the blocks-builder-manifest-generator package. The malicious code can fully compromise any computer that has the package installed, allowing unauthorized access to sensitive information such as secrets and keys. The origin of this vulnerability is linked to a malicious actor who has embedded harmful code in the package, making it a severe threat to users and their systems.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall blocks-builder-manifest-generatorIf 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
Currently, there are no effective workarounds to mitigate the risks posed by this vulnerability other than removing the package entirely. Users should ensure that they have removed the package and have taken steps to secure their systems.
Conclusion
The blocks-builder-manifest-generator package has been compromised with malicious code, posing a significant threat to users. Immediate action is required to uninstall the package and secure sensitive information. Users are encouraged to monitor their systems and utilize tools like Vulert for real-time vulnerability alerts.
See every vulnerability recorded for blocks-builder-manifest-generator →
FAQ
You should immediately uninstall the package and rotate any sensitive information stored on your system.
You can use the Vulert playground at Vulert Scanner to check if your application is affected without needing to sign up.
Having this package installed can lead to unauthorized access to your system and sensitive data, making it critical to remove it immediately.
After removing the package, you should rotate all secrets and keys from a secure computer to mitigate any potential damage.
If a patched version is released, updating the package will fix the issue. However, it is essential to remove the compromised version first.
