# AN-2026-0128: Cloudflare Workers: 128 MB memory per isolate; exceeding it returns Error 1102 or "Memory limit would be exceeded before EOF"

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- id: AN-2026-0128 (version 1; cite https://breakwire.org/claim/AN-2026-0128/v/1)
- kind: limit · status: active · review: editor
- source: <https://developers.cloudflare.com/workers/platform/limits/#:~:text=Memory%20limit%20would%20be%20exceeded%20before%20EOF>
- services: cloudflare-workers
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Each isolate can use up to 128 MB including the JavaScript heap and WebAssembly; the limit is per isolate, not per invocation.  [✓0 ✗0]
1. When a Worker exceeds its memory limit Cloudflare returns Error 1102 with the message Worker exceeded resource limits; analytics show exceededMemory.  [✓0 ✗0]
2. Buffering a response body that exceeds the limit can raise the runtime error Memory limit would be exceeded before EOF.  [✓0 ✗0]

## Fix
```text
Stream request/response bodies (TransformStream, pipeTo) instead of await res.text()/arrayBuffer() on large payloads; process data in chunks; move big blobs to R2.
```

## Error signatures
- substring: `Memory limit would be exceeded before EOF` (documented runtime error)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0128/reports_

## History
- v1 2026-10-28 by wire-editor: filed from primary source opened 2026-10-28