Update dependency starlette to v0.47.2 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
starlette (changelog)	==0.46.1 -> ==0.47.2

GitHub Vulnerability Alerts

CVE-2025-54121

Summary

When parsing a multi-part form with large files (greater than the default max spool size) starlette will block the main thread to roll the file over to disk. This blocks the event thread which means we can't accept new connections.

Details

Please see this discussion for details: https://github.com/encode/starlette/discussions/2927#discussioncomment-13721403. In summary the following UploadFile code (copied from here) has a minor bug. Instead of just checking for self._in_memory we should also check if the additional bytes will cause a rollover.

    @​property
    def _in_memory(self) -> bool:
        # check for SpooledTemporaryFile._rolled
        rolled_to_disk = getattr(self.file, "_rolled", True)
        return not rolled_to_disk

    async def write(self, data: bytes) -> None:
        if self.size is not None:
            self.size += len(data)

        if self._in_memory:
            self.file.write(data)
        else:
            await run_in_threadpool(self.file.write, data)

I have already created a PR which fixes the problem: https://github.com/encode/starlette/pull/2962

PoC

See the discussion here for steps on how to reproduce.

Impact

To be honest, very low and not many users will be impacted. Parsing large forms is already CPU intensive so the additional IO block doesn't slow down starlette that much on systems with modern HDDs/SSDs. If someone is running on tape they might see a greater impact.

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Release Notes

Kludex/starlette (starlette)

v0.47.2

Compare Source

Fixed

• Make UploadFile check for future rollover #​2962.

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New Contributors

• @​HonakerM made their first contribution in encode#2962

Full Changelog: Kludex/starlette@0.47.1...0.47.2

v0.47.1: Version 0.47.1

Compare Source

Fixed

• Use Self in TestClient.__enter__ #​2951
• Allow async exception handlers to type-check #​2949

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Full Changelog: Kludex/starlette@0.47.0...0.47.1

v0.47.0: Version 0.47.0

Compare Source

Added

• Add support for ASGI pathsend extension #​2671.
• Add partitioned attribute to Response.set_cookie #​2501.

Changed

• Change methods parameter type from list[str] to Collection[str] #​2903.
• Replace import typing by from typing import ... in the whole codebase #​2867.

Fixed

• Mark ExceptionMiddleware.http_exception as async to prevent thread creation #​2922.

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New Contributors

• @​danlapid made their first contribution in encode#2922
• @​Flecart made their first contribution in encode#2501
• @​AllenSH12 made their first contribution in encode#2936
• @​waketzheng made their first contribution in encode#2867
• @​jonathanberthias made their first contribution in encode#2903

Full Changelog: Kludex/starlette@0.46.2...0.47.0

v0.46.2: Version 0.46.2

Compare Source

What's Changed

• Use correct index on backwards compatible logic in TemplateResponse by @​alex-oleshkevich in encode#2909
• Prevents reraising of exception from BaseHTTPMiddleware by @​ramannanda9 in encode#2911

New Contributors

• @​ahryniv made their first contribution in encode#2913
• @​ramannanda9 made their first contribution in encode#2911

Full Changelog: Kludex/starlette@0.46.1...0.46.2

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