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June 22, 2026

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New features

Disable client-side API key validation — The JS and Python SDKs let you skip the default e2b_ API key format check. Useful for self-hosted deployments that issue API keys in a different format. Set E2B_VALIDATE_API_KEY=false, or pass validateApiKey: false (JS) / validate_api_key=False (Python) when creating a sandbox. Default behavior is unchanged. See API key.E2B_API_KEY accepted in template list and template create — The CLI now honors the E2B_API_KEY environment variable for these template commands, matching the rest of the CLI. See Templates.Composable integration user-agent — SDKs now let integrations append a custom identifier to the user-agent string, making it easier to attribute traffic from tools built on top of E2B.

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Updates

SDK auth cleanup — The SDKs’ auth handling has been tidied up. The ConnectionConfig access token field is now deprecated; prefer passing credentials via apiKey / headers. Existing code keeps working.Sandbox status timestamps — The orchestrator now tracks and reports the timestamp of the last status change for each sandbox, giving you more precise visibility into sandbox lifecycle events. See Lifecycle events.Faster sandbox cold boot — Guest cold-boot time has been reduced, so sandboxes start more quickly when no warm pool is available.More reliable filesystem snapshots — Snapshots now use FIFREEZE to quiesce the guest filesystem before capture, producing more consistent on-disk state for paused and snapshotted sandboxes. See Persistence and Snapshots.

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Bug fixes

  • Python SDK: Fixed flaky TimeoutException when streaming command output. Command timeouts are now enforced server-side. See Commands.
  • Python SDK: api_headers Authorization now takes precedence over the deprecated access_token field, so explicit header overrides work as expected.
  • JS SDK: Connection-dropped errors are now correctly detected on Bun and Deno during health checks, preventing false-positive failures.
  • SDKs (filesystem): Fixed WriteInfo.type enum, made timestamps timezone-aware, and enabled gzip on the default upload path. See Filesystem.
  • SDKs (filesystem): Resolved edge cases where signed upload/download URLs could be reported as expired prematurely. See Upload and Download.
  • Templates: Fixed build bugs and consolidated shell quoting so multi-line and quoted commands in template definitions behave predictably. See Defining a template.
  • BYOC storage: Removed an internal 30-second timeout on S3 uploads that could fail large object writes. See BYOC.
  • envd compatibility: Bumped the minimum envd version required for cgroup freeze to 0.6.3, fixing pause reliability on older templates.