Critical Malicious Code Vulnerability in @posthog/rrweb Package
Summary
MAL-2025-190673: Malicious code in @posthog/rrweb (npm). Affects @posthog/rrweb versions 0.0.31. No fix is published. How to fix ↓
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Background
The @posthog/rrweb package is a JavaScript library used for recording and replaying web sessions. It is commonly utilized in analytics and user experience research to capture user interactions on web applications. However, the package has been compromised, leading to severe security risks for any application that integrates it.
Vulnerability Detail
The vulnerability originates from malicious code embedded within the @posthog/rrweb package, specifically in version 0.0.31. This code can fully compromise any computer that has the package installed, allowing unauthorized access to sensitive information such as secrets and keys. The implications of this vulnerability are significant, as it may lead to data breaches and loss of control over the affected systems.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall @posthog/rrwebIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
As a workaround, it is recommended to avoid using the @posthog/rrweb package altogether until a secure version is released. If you need similar functionality, consider exploring alternative libraries that do not have known vulnerabilities.
Conclusion
The @posthog/rrweb package has been compromised with malicious code, posing a significant security risk. Users are urged to uninstall the package and rotate any sensitive information immediately. Monitoring tools like Vulert can help ensure your application remains secure from such vulnerabilities.
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FAQ
Immediately uninstall the package and rotate any sensitive information that may have been compromised.
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No, there is currently no patched version available. The only solution is to remove the package entirely.
Failing to address this vulnerability could lead to unauthorized access to sensitive data and potential data breaches.
It is strongly advised to avoid using the @posthog/rrweb package until a secure version is released.
