Tencent Cloud Open-Sources CubeSandbox for Secure, Fast AI Agent Code Execution

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Tencent Cloud has released CubeSandbox, an open-source sandbox service built in Rust to safely isolate and execute code generated by AI agents. Unlike standard Docker containers, it uses KVM and RustVMM to give each task its own dedicated guest OS kernel, preventing untrusted code from escaping to the host system. The sandbox boots in under 60 milliseconds and consumes less than 5MB of memory per instance, enabling thousands of concurrent isolated environments on a single machine. CubeSandbox is API-compatible with E2B, allowing developers to switch to self-hosted deployment by changing a single environment variable. The project supports both single-node and cluster deployments, with Terraform scripts included for streamlined cloud setup.

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