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resolvedcritical

Malware in @mcconnect/mcc-common-lib

Malware was discovered in the npm package @mcconnect/mcc-common-lib. Systems with this package installed are considered fully compromised and require immediate remediation.

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Disclosed
Last updated
Blast radius
Any system with the package installed or running
Ecosystems
Attack vectors
Affected entities
  • @mcconnect/mcc-common-lib

A critical malware incident was identified in the npm package @mcconnect/mcc-common-lib. The malicious package grants full control of affected systems to an outside entity.\n\nAny computer with this package installed or running should be considered fully compromised. All secrets, keys, and credentials stored on affected systems must be rotated immediately from a different, unaffected computer.\n\nWhile the package should be removed, complete removal of all malicious software cannot be guaranteed due to the level of system compromise. A comprehensive security review and potential system rebuild may be necessary for affected environments.

Indicators of compromise

Packages
  • @mcconnect/mcc-common-lib

Remediation

  • Immediately remove @mcconnect/mcc-common-lib from all systems
  • Rotate all secrets, keys, and credentials from a different, unaffected computer
  • Conduct a comprehensive security audit of affected systems
  • Consider full system rebuild or forensic analysis to ensure complete removal of malicious software
  • Review access logs and monitor for unauthorized activity on affected systems
  • Notify all users and systems that may have been impacted

Sources

  1. GitHub Advisory GHSA-xpr4-wg5r-33c8 · GitHub Advisory Database

Cite this entry

"Malware in @mcconnect/mcc-common-lib." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 29, 2026; last updated June 29, 2026. https://supplychainattack.org/incident/malware-in-mcconnect-mcc-common-lib-1rmuza

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