Resolved: Elevated ERR_STREAM_PREMATURE_CLOSE errors in Vercel Functions

Incident Report for Vercel

Resolved

Between Jun 19 09:09 and 16:16 UTC, a subset of Vercel Functions using node-fetch@2 may have experienced intermittent invocation errors that surfaced as ERR_STREAM_PREMATURE_CLOSE.

As part of Node.js June 2026 security releases, we began rolling out new Node.js versions. Those versions contain an upstream regression that breaks response streaming for node-fetch@2, which caused the errors https://github.com/nodejs/node/issues/63989

We have resolved the issue by reverting to the previous Node.js version. No action is required — affected functions are now operating normally. We will re-land the Node.js upgrade once the upstream issue is fixed.

Posted Jun 19, 2026 - 17:54 UTC

This incident affected: Functions.