chore(deps): update dependency starlette to v0.47.2 [security]

[renovate]

Note

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This notice will be removed on 2025-10-07.

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This PR contains the following updates:

Package	Update	Change	OpenSSF
starlette (changelog)	minor	==0.40.0 -> ==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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Starlette has possible denial-of-service vector when parsing large files in multipart forms

CVE-2025-54121 / GHSA-2c2j-9gv5-cj73

More information

Details

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.

Severity

• CVSS Score: 5.3 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

• https://github.com/encode/starlette/security/advisories/GHSA-2c2j-9gv5-cj73
• https://nvd.nist.gov/vuln/detail/CVE-2025-54121
• https://github.com/encode/starlette/commit/9f7ec2eb512fcc3fe90b43cb9dd9e1d08696bec1
• https://github.com/encode/starlette
• https://github.com/encode/starlette/blob/fa5355442753f794965ae1af0f87f9fec1b9a3de/starlette/datastructures.py#L436C5-L447C14
• https://github.com/encode/starlette/discussions/2927#discussioncomment-13721403

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

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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

v0.46.1: Version 0.46.1

Compare Source

Fixed

• Allow relative directory path when follow_symlinks=True #​2896.

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Full Changelog: Kludex/starlette@0.46.0...0.46.1

v0.46.0: Version 0.46.0

Compare Source

Added

• GZipMiddleware: Make sure Vary header is always added if a response can be compressed #​2865.

Fixed

• Raise exception from background task on BaseHTTPMiddleware #​2812.
• GZipMiddleware: Don't compress on server sent events #​2871.

Changed

• MultiPartParser: Rename max_file_size to spool_max_size #​2780.

Deprecated

• Add deprecated warning to TestClient(timeout=...) #​2840.

New Contributors

• @​musicinmybrain made their first contribution in encode#2855
• @​WilliamDEdwards made their first contribution in encode#2870
• @​mattmess1221 made their first contribution in encode#2865

Full Changelog: Kludex/starlette@0.45.3...0.46.0

v0.45.3: Version 0.45.3

Compare Source

Fixed

• Turn directory into string on lookup_path on commonpath comparison by @​Kludex in encode#2851

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Full Changelog: Kludex/starlette@0.45.2...0.45.3

v0.45.2: Version 0.45.2

Compare Source

Fixed

• Make create_memory_object_stream compatible with old anyio versions once again, and bump anyio minimum version to 3.6.2 by @​graingert in #​2833.

Full Changelog: Kludex/starlette@0.45.1...0.45.2

v0.45.1: Version 0.45.1

Compare Source

Fixed

• Collect errors more reliably from WebSocket test client by @​graingert in encode#2814
• Fix unclosed MemoryObjectReceiveStream upon exception in BaseHTTPMiddleware children by @​Kludex in encode#2813

Refactor

• Use a pair of memory object streams instead of two queues by @​graingert in encode#2829

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Full Changelog: Kludex/starlette@0.45.0...0.45.1

v0.45.0: Version 0.45.0

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Removed

• Drop Python 3.8 by @​Kludex in encode#2823
• Remove ExceptionMiddleware import proxy from starlette.exceptions module by @​Kludex in encode#2826
• Remove deprecated WS_1004_NO_STATUS_RCVD and WS_1005_ABNORMAL_CLOSURE by @​Kludex in encode#2827

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Full Changelog: Kludex/starlette@0.44.0...0.45.0

v0.44.0: Version 0.44.0

Compare Source

Added

• Add max_part_size parameter to Request.form() by @​iudeen in encode#2815
• Add client parameter to TestClient by @​iudeen in encode#2810

New Contributors

• @​iudeen made their first contribution in encode#2815

Full Changelog: Kludex/starlette@0.43.0...0.44.0

v0.43.0: Version 0.43.0

Compare Source

Removed

• Remove deprecated allow_redirects argument from TestClient #​2808.

Added

• Make UUID path parameter conversion more flexible #​2806.

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New Contributors

• @​AbduazizZiyodov made their first contribution in encode#2799
• @​edthrn made their first contribution in encode#2806

Full Changelog: Kludex/starlette@0.42.0...0.43.0

v0.42.0: Version 0.42.0

Compare Source

Added

• Raise ClientDisconnect on StreamingResponse #​2732.

Fixed

• Use ETag from headers when parsing If-Range in FileResponse #​2761.
• Follow directory symlinks in StaticFiles when follow_symlinks=True #​2711.
• Bump minimum python-multipart version to 0.0.18 0ba8395.
• Bump minimum httpx version to 0.27.0 #​2773.

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New Contributors

• @​logan-connolly made their first contribution in encode#2763
• @​eltoder made their first contribution in encode#2768
• @​hanxi made their first contribution in encode#2711
• @​viccie30 made their first contribution in encode#2761
• @​dbowring made their first contribution in encode#2782
• @​lealre made their first contribution in encode#2793

Full Changelog: Kludex/starlette@0.41.3...0.42.0

v0.41.3: Version 0.41.3

Compare Source

Fixed

• Exclude the query parameters from the scope[raw_path] on the TestClient #​2716.
• Replace dict by Mapping on HTTPException.headers #​2749.
• Correct middleware argument passing and improve factory pattern #​2752.

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Full Changelog: Kludex/starlette@0.41.2...0.41.3

v0.41.2: Version 0.41.2

Compare Source

What's Changed

• Revert bump on python-multipart by @​Kludex in encode#2737

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Full Changelog: Kludex/starlette@0.41.1...0.41.2

v0.41.1: Version 0.41.1

Compare Source

What's Changed

• Change python-multipart import to python_multipart by @​Kludex in encode#2733
• Bump minimum python-multipart version to 0.0.13 by @​Kludex in encode#2734

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Full Changelog: Kludex/starlette@0.41.0...0.41.1

v0.41.0: Version 0.41.0

Compare Source

Added

• Allow to raise HTTPException before websocket.accept() encode#2725

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