CubeSandbox

CubeSandbox is a high-performance sandbox service designed specifically for AI agents. It provides instant, concurrent, and secure execution environments using MicroVM technology with hardware isolation. Each sandbox runs a dedicated OS kernel, ensuring strong security guarantees. The platform is optimized for agent workflows, offering ultra-fast startup via resource pooling and snapshot cloning, eliminating cold-start latency. It supports high-density deployment with MB-level per-sandbox overhead, enabling thousands of instances per server through kernel sharing and Copy-on-Write. CubeSandbox also features an eBPF-based network security system with inter-sandbox isolation, egress filtering, and a built-in L7 security proxy for per-domain/path/method policies and automatic credential injection. State management includes creating checkpoints, rolling back to any saved state, and forking into parallel environments at millisecond granularity. The service is E2B SDK compatible, allowing a drop-in replacement by changing one environment variable. CubeSandbox is built for AI agent developers, researchers, and teams needing scalable, secure sandboxing for code execution, browser automation, reinforcement learning, and multi-agent coordination. Compared to managed cloud sandboxes, CubeSandbox offers open-source flexibility and self-hosting control, but requires more technical expertise to deploy.