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Replace unbounded `arrayBuffer()`/`blob()` calls in `download()` and `downloadBlob()` with streaming reads that enforce a 2 GiB default size limit. Add `abortSignal` passthrough from callers (`transcribe`, `generateVideo`) to `fetch()`. Add `maxDownloadSize` option to `transcribe()` and `experimental_generateVideo()` for configuring the limit. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update API reference docs and fix JSDoc/changeset to reflect actual 1 GiB default (changed from 2 GiB during review). Update test Content-Length values to match. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replace `maxDownloadSize` parameter with a configurable `download`
function in `transcribe()` and `experimental_generateVideo()`. Add
`createDownload({ maxBytes })` factory exported from `ai` so users
can create download functions with custom size limits.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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why is the download blob function in |
lgrammel
reviewed
Feb 12, 2026
| export { convertToFormData } from './convert-to-form-data'; | ||
| export { downloadBlob } from './download-blob'; | ||
| export { DownloadError } from './download-error'; | ||
| export { |
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a) could this be part of the ai pkg instead
b) the difference between file and function name is strange
lgrammel
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Feb 12, 2026
Collaborator
Author
it's also used by I'll look into refactoring but not yet sure if it's worth it.
Will fix, thanks |
Collaborator
Author
|
I tried some refactoring, but it would lead to a circular dependency or code duplication to move |
gr2m
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Feb 12, 2026
- Replace unbounded `arrayBuffer()`/`blob()` calls in `download()` and
`downloadBlob()` with streaming reads that enforce a **2 GiB default
size limit**
- Add `abortSignal` passthrough from callers (`transcribe`,
`generateVideo`) to `fetch()`
- Check `Content-Length` header for early rejection before reading body
- Track bytes incrementally via `ReadableStream.getReader()`, abort with
`DownloadError` when limit exceeded
- Expose configurable `download` parameter on `transcribe()` and
`experimental_generateVideo()` (instead of adding a new
`maxDownloadSize` argument) — keeps download config separate from API
function signatures
- Export `createDownload({ maxBytes })` factory from `ai` for custom
size limits
closes #9481 / addresses
#9481 (comment)
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: vercel[bot] <35613825+vercel[bot]@users.noreply.github.com>
This was referenced Feb 12, 2026
gr2m
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Feb 12, 2026
## Summary - Backport of #12445 to `release-v5.0` - Adds size-limited download via `readResponseWithSizeLimit` to prevent unbounded memory consumption (DoS) - Adds `maxBytes` and `abortSignal` parameters to download functions - Skipped generate-video and download-blob changes (files don't exist on v5.0) ## Test plan - [x] Test changes against local POC Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> Co-authored-by: vercel[bot] <35613825+vercel[bot]@users.noreply.github.com>
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arrayBuffer()/blob()calls indownload()anddownloadBlob()with streaming reads that enforce a 2 GiB default size limitabortSignalpassthrough from callers (transcribe,generateVideo) tofetch()Content-Lengthheader for early rejection before reading bodyReadableStream.getReader(), abort withDownloadErrorwhen limit exceededdownloadparameter ontranscribe()andexperimental_generateVideo()(instead of adding a newmaxDownloadSizeargument) — keeps download config separate from API function signaturescreateDownload({ maxBytes })factory fromaifor custom size limitscloses #9481 / addresses #9481 (comment)