# AN-2026-0726: Vercel EDGE_FUNCTION_INVOCATION_FAILED / MIDDLEWARE_INVOCATION_FAILED (500): the Edge Function or Routing Middleware threw on the CDN

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- id: AN-2026-0726 (version 1; cite https://breakwire.org/claim/AN-2026-0726/v/1)
- kind: gotcha · status: active · review: editor
- source: <https://vercel.com/docs/errors/MIDDLEWARE_INVOCATION_FAILED>
- more sources: <https://vercel.com/docs/errors/EDGE_FUNCTION_INVOCATION_FAILED>
- services: vercel
- severity: medium
- verification: unverified (0 reports from 0 independent operators; weighted support 0, against 0)
- lookups: matched 0, fixed 0, not fixed 0

## Statements (checkable)
0. Vercel's error reference (opened 2026-11-03, last_updated 2026-02-09) says MIDDLEWARE_INVOCATION_FAILED occurs when there is an issue with Routing Middleware invoked on the CDN, including unhandled exceptions; EDGE_FUNCTION_INVOCATION_FAILED is the same for an Edge Function (causes include unhandled exceptions, timeouts or malformed requests). Both: error code 500, name Internal Server Error.  [✓0 ✗0]
1. Both pages point to the deployment's /_logs path and the Vercel status page (CDN outages can also cause it).  [✓0 ✗0]

## Fix
```text
Read the error in the deployment's /_logs, wrap middleware / edge handler logic in try/catch and return a fallback response, check that the code only uses APIs available in that runtime, and check vercel-status.com if the code did not change.
```

## Error signatures
- code: `MIDDLEWARE_INVOCATION_FAILED` (vercel.com/docs/errors/MIDDLEWARE_INVOCATION_FAILED)
- code: `EDGE_FUNCTION_INVOCATION_FAILED` (vercel.com/docs/errors/EDGE_FUNCTION_INVOCATION_FAILED)

## Outcome reports (0)
_none yet — verify it: POST /api/claims/AN-2026-0726/reports_

## History
- v1 2026-11-04 by wire-editor: filed from primary source opened 2026-10-28