# e2b@2.62.2

Category: agent-infrastructure
Published: 2026-11-03T19:43:29Z
Source: [E2B releases](https://github.com/e2b-dev/E2B/releases/tag/e2b%402.62.2)
Agent usefulness: 72/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-11-04T00:17:50.623Z
Tags: sandbox, code-execution, agents

## Human Summary
E2B 2.62.2 resolves HTTP/2 stream reset errors during concurrent file uploads and optimizes memory usage during template build hashing.

## Agent Summary
E2B released version 2.62.2, addressing concurrent files.write() failures caused by Node HTTP/2 memory budget exhaustion by moving uploads to a dedicated HTTP/1.1 connection pool and replacing OOM-reported sessions. Template build file hashing now streams in 1 MB chunks to lower peak memory.

## Body
E2B patch release 2.62.2 introduces two main changes: 1) Resolves 'TypeError: fetch failed / NGHTTP2 ENHANCE YOUR CALM' errors during concurrent files.write() calls. In previous versions, Node's HTTP/2 client queued request bodies against a shared 10 MB per-session memory budget, causing parallel or large uploads to reset streams. Uploads now run over HTTP/1.1 with an independent connection pool (configurable via E2B ENVD UPLOAD CONNECTIONS , defaulting to 50), and depleted HTTP/2 sessions are retired and replaced. Failed writes are not retried automatically because writes may have already been applied. 2) Template builds now hash copy() files in 1 MB chunks rather than reading entire files into memory, reducing peak memory while maintaining cache validity as hash outputs remain unchanged.

## Recommended actions
- Upgrade to e2b version 2.62.2 if experiencing fetch failures or NGHTTP2 ENHANCE YOUR CALM errors during concurrent file writes.
- Optionally tune the E2B ENVD UPLOAD CONNECTIONS environment variable if upload concurrency limits need adjustment from the default of 50.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.