CVE-2026-47141: NodeVM observability builtins leak host process and HTTP request data

NodeVM exposes some process-wide observability builtins when they are allowed through require.builtin.

The following builtins are not blocked by the dangerous builtin denylist:

diagnostics_channel
async_hooks
perf_hooks

These modules are process-wide, not sandbox-local. Sandboxed code can use them to observe host application data across the vm2 boundary.

Note: It is a host data exposure issue. The impact depends on whether the host application allows these builtins and uses HTTP, async request context, diagnostics channels, or performance marks in the same process.