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Malware in ts-esys

Malware was discovered in the npm package ts-esys. Systems with this package installed or running are considered fully compromised and require immediate remediation.

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

A malware incident was identified in the npm package ts-esys, published as GitHub Advisory GHSA-76f5-jq4m-cjc3 on June 19, 2026.\n\nAccording to the advisory, any computer with this package installed or running should be considered fully compromised. The malware grants outside entities full control of affected systems.\n\nImmediate remediation requires rotating all secrets and keys from a different, uncompromised 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\nAffected package: ts-esys (npm).

Indicators of compromise

Packages
  • ts-esys

Remediation

  • Immediately rotate all secrets and keys from a different, uncompromised computer
  • Remove the ts-esys package from all affected systems
  • Conduct a full security audit of any system that had ts-esys installed
  • Monitor affected systems for signs of persistent malware or unauthorized access
  • Review logs and network traffic from systems that ran ts-esys for indicators of compromise

Sources

  1. GitHub Advisory GHSA-76f5-jq4m-cjc3 · GitHub Advisory Database

Cite this entry

"Malware in ts-esys." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 19, 2026; last updated June 20, 2026. https://supplychainattack.org/incident/malware-in-ts-esys-1cudf0

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