Malware in @mastra/stagehand
Malware was discovered in the npm package @mastra/stagehand. Systems with this package installed are considered fully compromised and require immediate remediation including secret rotation and package removal.
- Disclosed
- Last updated
- Blast radius
- Any system with @mastra/stagehand installed
- Ecosystems
- Attack vectors
- Affected entities
- @mastra/stagehand
A critical malware incident was identified in the npm package @mastra/stagehand, published via GitHub Advisory GHSA-x59w-qg4x-cmrx on June 17, 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 is required: all secrets and keys stored on affected computers must be rotated from a different, uncompromised system. 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 initial compromise.
Indicators of compromise
- Packages
- @mastra/stagehand
Remediation
- Immediately rotate all secrets and keys from a different, uncompromised computer
- Remove the @mastra/stagehand package from all affected systems
- Assume full system compromise and conduct forensic analysis
- Monitor affected systems for signs of persistent malware or backdoors
- Review system logs and network traffic for indicators of compromise
Sources
- GitHub Advisory GHSA-x59w-qg4x-cmrx · GitHub Advisory Database
Cite this entry
"Malware in @mastra/stagehand." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed June 17, 2026; last updated June 20, 2026. https://supplychainattack.org/incident/malware-in-mastra-stagehand-12d5s6
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