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June 8, 2026
Weekly release

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New features

  • Stdin streaming for commands. CommandHandle now exposes sendStdin and closeStdin so you can write to a running process’s standard input and close it when you’re done. Useful for interactive CLIs and programs that read from stdin. See Commands.
  • Allocated resource metrics. The orchestrator now exports per-sandbox CPU and memory allocation metrics, giving better visibility into resource usage across your fleet.
  • Paginated templates list. The dashboard API’s templates list endpoint now supports pagination, making it easier to work with large template catalogs.
  • Cross-generation CPU compatibility. Sandboxes can now be scheduled across mixed CPU generations (N2 → N4), improving capacity and reducing scheduling failures.
  • API-only header options on the SDK. Pass custom headers to the API client without affecting envd requests, useful for proxy and observability setups.

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Updates

  • CLI template build deprecation. The v1 template build command is now fully deprecated in favor of the v2 build flow. See the v2 migration guide and template quickstart.
  • Client-side API key validation. The SDKs now validate the format of your E2B API key before making requests, surfacing configuration errors earlier.
  • Memory oversubscription enabled. Nomad memory oversubscription is now on, improving sandbox packing density and capacity headroom.

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Bug fixes

  • Security: Restricted ~/.e2b/config.json permissions to owner-only on the CLI to prevent credentials from being readable by other local users.
  • Security: Bumped ws to >=8.20.1 to address CVE-2026-45736 in the JavaScript SDK.
  • Python SDK: Switched to thread-local API transports so the SDK behaves correctly under multi-threaded workloads.
  • Python SDK: CommandHandle.wait() now correctly awaits async callbacks.
  • SDK rate limits: envd 429 responses now surface as a consistent RateLimitError across both SDKs.
  • Dockerfile builds: fromDockerfile now handles multi-source COPY/ADD instructions correctly.
  • Template aliases: The template exists endpoint now checks alias tags, fixing false negatives when looking up templates by alias.
  • Scheduling: Base build IDs are now split per artifact, fixing rare scheduling conflicts during template builds.