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containedcritical

Malware in leo-cron

Malware was discovered in the leo-cron npm package. Systems with the package installed or running should be considered fully compromised and require immediate remediation.

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Disclosed
Last updated
Blast radius
Any system with leo-cron installed or running
Ecosystems
npm
Attack vectors
Compromised package
Affected entities
  • leo-cron

The leo-cron npm package was found to contain malware. According to the GitHub Advisory (GHSA-v66r-c2h4-w9qw), any computer with this package installed or running should be considered fully compromised.\n\nThe advisory recommends immediate rotation of all secrets and keys from a different, unaffected computer. While the package should be removed, there is no guarantee that removal will eliminate all malicious software that may have been installed as a result of the compromise.\n\nThis represents a critical supply chain attack through a compromised package in the npm ecosystem.

Indicators of compromise

Packages
  • leo-cron

Remediation

  • Immediately rotate all secrets, API keys, and credentials from a different, unaffected computer
  • Remove the leo-cron package from all affected systems
  • Conduct a full security audit of any system that had leo-cron installed
  • Review system logs and network traffic for signs of unauthorized access or data exfiltration
  • Consider the affected system(s) as potentially fully compromised and plan for complete rebuild if critical systems are involved

Sources

  1. GitHub Advisory GHSA-v66r-c2h4-w9qw · GitHub Advisory Database

Cite this entry

"Malware in leo-cron." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 25, 2026; last updated June 29, 2026. https://supplychainattack.org/incident/malware-in-leo-cron-rfwuts

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