Vercel· 11 AugA sandbox without a network boundary is only half a sandbox
Vercel explains why network isolation is essential for sandbox security
Vercel published a technical post arguing that sandbox security requires both compute isolation and network egress control, because untrusted code can exfiltrate data or attack external systems without escaping the VM.
The post describes how Vercel's sandbox firewall enforces domain and CIDR policies by inspecting TLS handshakes and filtering DNS traffic on the host, outside the microVM.
