AIKIDO-2026-526145

TL;DR

@ai-sdk/provider-utils converts Uint8Array file parts to base64 by appending one character per byte into a single JavaScript string before calling btoa. Encoding a large byte array, such as an uploaded image or file attachment, builds many large intermediate strings and can exhaust the process heap. A byte array of roughly 14 MB reproducibly triggers a V8 out-of-memory crash that terminates the running process. The fix converts the array in bounded 4,096-byte chunks and joins them once before base64 encoding.