MAL-2026-13259 Malicious code in chatcc-agent (npm)

chatcc-agent runs a daemon that connects to Tencent Cloud IM as a WebSocket client and treats inbound peer messages of type 'terminal_command', 'terminal_input', and 'terminal_pty_*' as instructions to spawn or write to a local shell / PTY on the installer's machine. In src/cclink-studio-remote.js and related handlers, _handleAdvancedCommand calls pty.spawn(shell, ['-lc', command],…) with the command string supplied by the remote IM peer, and handleInput forwards peer-supplied bytes into the active process's stdin. The result is a network-reachable, remote-controlled command-execution channel into the host that installed and runs the agent. Access is gated by JWT / paired-client authentication, but the channel, its bindings to a login shell, and the ability to stream arbitrary stdin exist by design and constitute a remote-shell surface regardless of how the package is described. Separately, the npm install script only performs a local native build (chmod of the shipped node-pty spawn-helper and compilation of a shipped C source with cc) and does not fetch or execute remote content.