Update dependency starlette to ^0.47.0 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
starlette (changelog)	^0.38.0 -> ^0.47.0

GitHub Vulnerability Alerts

CVE-2024-47874

Summary

Starlette treats multipart/form-data parts without a filename as text form fields and buffers those in byte strings with no size limit. This allows an attacker to upload arbitrary large form fields and cause Starlette to both slow down significantly due to excessive memory allocations and copy operations, and also consume more and more memory until the server starts swapping and grinds to a halt, or the OS terminates the server process with an OOM error. Uploading multiple such requests in parallel may be enough to render a service practically unusable, even if reasonable request size limits are enforced by a reverse proxy in front of Starlette.

PoC

from starlette.applications import Starlette
from starlette.routing import Route

async def poc(request):
    async with request.form():
        pass

app = Starlette(routes=[
    Route('/', poc, methods=["POST"]),
])

curl http://localhost:8000 -F 'big=</dev/urandom'

Impact

This Denial of service (DoS) vulnerability affects all applications built with Starlette (or FastAPI) accepting form requests.

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.

---

Release Notes

Kludex/starlette (starlette)

v0.47.2

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Fixed

• Make UploadFile check for future rollover #​2962.

---

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

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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

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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.

---

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

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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

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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

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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

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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

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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

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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

---

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

v0.44.0: Version 0.44.0

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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

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Removed

• Remove deprecated allow_redirects argument from TestClient #​2808.

Added

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

---

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

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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.

---

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

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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

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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

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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

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Added

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

v0.40.0: Version 0.40.0

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This release fixes a Denial of service (DoS) via multipart/form-data requests.

You can view the full security advisory:
GHSA-f96h-pmfr-66vw

Fixed

• Add max_part_size to MultiPartParser to limit the size of parts in multipart/form-data
  requests fd038f3.

v0.39.2: Version 0.39.2

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Fixed

• Allow use of request.url_for when only "app" scope is available #​2672.
• Fix internal type hints to support python-multipart==0.0.12 #​2708.

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Full Changelog: Kludex/starlette@0.39.1...0.39.2

v0.39.1: Version 0.39.1

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Fixed

• Avoid regex re-compilation in responses.py and schemas.py #​2700.
• Improve performance of get_route_path by removing regular expression usage #​2701.
• Consider FileResponse.chunk_size when handling multiple ranges #​2703.
• Use token_hex for generating multipart boundary strings #​2702.

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Full Changelog: Kludex/starlette@0.39.0...0.39.1

v0.39.0: Version 0.39.0

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Added

• Add support for HTTP Range to FileResponse #​2697

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Full Changelog: Kludex/starlette@0.38.6...0.39.0

v0.38.6: Version 0.38.6

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Fixed

• Close unclosed MemoryObjectReceiveStream in TestClient #​2693.

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Full Changelog: Kludex/starlette@0.38.5...0.38.6

v0.38.5: Version 0.38.5

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Fixed

• Schedule BackgroundTasks from within BaseHTTPMiddleware #​2688.
  This behavior was removed in 0.38.3, and is now restored.

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Full Changelog: Kludex/starlette@0.38.4...0.38.5

v0.38.4: Version 0.38.4

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Fixed

• Ensure accurate root_path removal in get_route_path function #​2600

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Full Changelog: Kludex/starlette@0.38.3...0.38.4

v0.38.3: Version 0.38.3

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Added

• Support for Python 3.13 #​2662.

Fixed

• Don't poll for disconnects in BaseHTTPMiddleware via StreamingResponse #​2620.

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Full Changelog: Kludex/starlette@0.38.2...0.38.3

v0.38.2: Version 0.38.2

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Fixed

• Fix routing.get_name() not to assume all routines have __name__ #​2648

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Full Changelog: Kludex/starlette@0.38.1...0.38.2

v0.38.1: Version 0.38.1

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Removed

• Revert "Add support for ASGI pathsend extension" #​2649.

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Full Changelog: Kludex/starlette@0.38.0...0.38.1

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