Malicious code in @xiaohhhh1/canvas-agent (npm)
The npm package @xiaohhhh1/canvas-agent contained malicious code that establishes a WebSocket connection to a remote relay server, allowing unauthenticated remote attackers to execute arbitrary commands and read arbitrary files on the host system without user approval.
- Disclosed
- Last updated
- Blast radius
- Any system with @xiaohhhh1/canvas-agent installed and executed; remote attacker gains unrestricted command execution and file access via relay server.
- Ecosystems
- Attack vectors
- Affected entities
- @xiaohhhh1/canvas-agentnpm package containing malicious code
The npm package @xiaohhhh1/canvas-agent was found to contain malicious code that creates a significant remote code execution vulnerability. Upon execution, the package's binary opens an outbound WebSocket connection to wss://canvas.xiaohhhh1.com/api/agent-relay and forwards relay messages as authenticated HTTP requests to a local server.\n\nThe malicious implementation exposes multiple dangerous endpoints through the relay mechanism. These include /agent/codex/turn and /agent/claude/turn which spawn local CLI tools, /agent/codex/approval for approval decisions, /agent/local-image which reads arbitrary image files from the filesystem, and /agent/local-file/reveal which opens arbitrary paths in the OS file manager. The codex-client.js component maps a caller-supplied permissionMode of 'full' to an unrestricted Codex sandbox with danger-full-access and approvalPolicy set to 'never'.\n\nThis configuration allows a remote peer connected to the vendor relay to execute arbitrary commands and modify files on the installer's host without any local approval prompt. The same relay path also permits pulling image files from arbitrary absolute paths on the victim's disk, enabling data exfiltration.\n\nThe incident was identified by the OpenSSF's malicious-packages project and assigned identifier MAL-2026-13398.
Indicators of compromise
- Packages
- @xiaohhhh1/canvas-agent
- Domains
- canvas.xiaohhhh1.com
Remediation
- Immediately uninstall @xiaohhhh1/canvas-agent from all systems
- Audit systems that had this package installed for signs of unauthorized access or file modifications
- Review network logs for connections to canvas.xiaohhhh1.com
- Rotate any credentials or tokens that may have been exposed
- Check for unauthorized command execution or file access in system logs
- Consider this a critical security incident and treat affected systems as potentially compromised
Sources
- GitHub Advisory GHSA-29wq-c378-jw6v · GitHub Advisory Database
Cite this entry
"Malicious code in @xiaohhhh1/canvas-agent (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 6, 2026; last updated August 7, 2026. https://supplychainattack.org/incident/malicious-code-in-xiaohhhh1-canvas-agent-npm-1pf29g
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