Critical Malicious Code Vulnerability in polymarket-onchain Package
Summary
MAL-2026-1963: Malicious code in polymarket-onchain (npm). Affected versions are not published. No fix is published. How to fix ↓
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Background
The polymarket-onchain package is an npm library designed for facilitating on-chain market transactions. It allows developers to create decentralized applications that leverage market data. However, this package has been compromised, leading to significant security concerns for any system utilizing it.
Vulnerability Detail
The vulnerability originates from the inclusion of malicious code within the polymarket-onchain 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 implications of this vulnerability are severe, as it may lead to data breaches and loss of control over the affected systems. Users are advised to treat any system running this package as fully compromised.
How To Fix
This package is malicious. Remove it and rotate any credentials it could have accessed.
npm uninstall polymarket-onchainIf it arrived as a transitive dependency, remove the package that pulled it in, then reinstall.
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Workaround
There are no effective workarounds for this vulnerability. The only recommended action is to uninstall the polymarket-onchain package and secure your system.
Conclusion
The polymarket-onchain package has been compromised with malicious code, posing a significant risk to any systems utilizing it. Immediate action is required to uninstall the package and secure sensitive information. Users should remain vigilant and utilize tools like Vulert to monitor for vulnerabilities in their software.
See every vulnerability recorded for polymarket-onchain →
FAQ
You should immediately uninstall the polymarket-onchain package and rotate all sensitive information stored on the affected system.
You can use Vulert, which monitors and alerts for open-source vulnerabilities. Visit Vulert Scanner to check your application without needing to sign up.
Failing to address this vulnerability can lead to unauthorized access to sensitive data, potential data breaches, and loss of control over your systems.
The best mitigation strategy is to remove the package entirely, as there are no effective workarounds to secure it.
While this incident raises concerns, it is essential to evaluate each package individually. Regularly monitor your dependencies for vulnerabilities using tools like Vulert.
References
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