CVE-2026-65590: n8n: computer-use Shell Sandbox Not Enforced on Linux and Windows

The shell tool in the @n8n/computer-use package applied its sandbox restrictions only on macOS. On Linux and Windows, shell commands executed by the tool ran without any filesystem or network restrictions, allowing unrestricted access to the host filesystem and network from within the computer-use agent process.

This issue only affects deployments where the @n8n/computer-use package is explicitly installed and running. It does not affect standard n8n installations.