CubeSandbox
Execution SandboxOpen source · Apache-2.0★ 12,798（2026-10-04）Self-hosted
Tencent Cloud's open-source microVM agent sandbox, E2B-SDK compatible.
CubeSandbox, open-sourced by Tencent Cloud on 21 April 2026 under Apache-2.0, runs each agent in a KVM-isolated microVM built on RustVMM: it reports a best-case cold start under 60ms (about 67ms average) and under 5MB memory overhead per sandbox, and is API-compatible with the E2B SDK.
Caveat: The <60ms figure is a best case at low concurrency; P95 is ~90ms and P99 ~137ms under 50 concurrent creates on bare metal per the project.
Key facts
| Category | Execution Sandbox |
|---|---|
| License | Apache-2.0 |
| Language | Rust |
| Self-hosted | Yes |
| GitHub stars | 12,798 (2026-10-04) |
| Last push | 2026-09-30 |
| Last verified | 2026-10-04 |
| Repository | https://github.com/TencentCloud/CubeSandbox |
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