build(deps): update dependency starlette to v0.40.0 [security] (hotfix/8.4)
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Current evaluation
Merged security hotfix updating starlette from 0.38.4 to 0.40.0 on the hotfix/8.4 branch. Resolves CVE-2024-47874 DoS vulnerability in multipart/form-data parsing. Approved by two reviewers and passed CI.
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Issue body
This PR contains the following updates:
| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [starlette](https://redirect.github.com/encode/starlette) ([changelog](https://www.starlette.io/release-notes/)) | `==0.38.4` -> `==0.40.0` | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) |
### GitHub Vulnerability Alerts
#### [CVE-2024-47874](https://redirect.github.com/encode/starlette/security/advisories/GHSA-f96h-pmfr-66vw)
### 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
```python
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"]),
])
```
```sh
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.
---
### Release Notes
<details>
<summary>encode/starlette (starlette)</summary>
### [`v0.40.0`](https://redirect.github.com/encode/starlette/releases/tag/0.40.0): Version 0.40.0
[Compare Source](https://redirect.github.com/encode/starlette/compare/0.39.2...0.40.0)
This release fixes a Denial of service (DoS) via `multipart/form-data` requests.
You can view the full security advisory:
[GHSA-f96h-pmfr-66vw](https://redirect.github.com/encode/starlette/security/advisories/GHSA-f96h-pmfr-66vw)
#### Fixed
- Add `max_part_size` to `MultiPartParser` to limit the size of parts in `multipart/form-data`
requests [fd038f3](https://redirect.github.com/encode/starlette/commit/fd038f3070c302bff17ef7d173dbb0b007617733).
### [`v0.39.2`](https://redirect.github.com/encode/starlette/releases/tag/0.39.2): Version 0.39.2
[Compare Source](https://redirect.github.com/encode/starlette/compare/0.39.1...0.39.2)
##### Fixed
- Allow use of `request.url_for` when only "app" scope is available [#​2672](https://redirect.github.com/encode/starlette/pull/2672).
- Fix internal type hints to support `python-multipart==0.0.12` [#​2708](https://redirect.github.com/encode/starlette/pull/2708).
***
**Full Changelog**: https://github.com/encode/starlette/compare/0.39.1...0.39.2
### [`v0.39.1`](https://redirect.github.com/encode/starlette/releases/tag/0.39.1): Version 0.39.1
[Compare Source](https://redirect.github.com/encode/starlette/compare/0.39.0...0.39.1)
#### Fixed
- Avoid regex re-compilation in `responses.py` and `schemas.py` [#​2700](https://redirect.github.com/encode/starlette/pull/2700).
- Improve performance of `get_route_path` by removing regular expression usage [#​2701](https://redirect.github.com/encode/starlette/pull/2701).
- Consider `FileResponse.chunk_size` when handling multiple ranges [#​2703](https://redirect.github.com/encode/starlette/pull/2703).
- Use `token_hex` for generating multipart boundary strings [#​2702](https://redirect.github.com/encode/starlette/pull/2702).
***
**Full Changelog**: https://github.com/encode/starlette/compare/0.39.0...0.39.1
### [`v0.39.0`](https://redirect.github.com/encode/starlette/releases/tag/0.39.0): Version 0.39.0
[Compare Source](https://redirect.github.com/encode/starlette/compare/0.38.6...0.39.0)
#### Added
- Add support for HTTP Range to `FileResponse` [#​2697](https://redirect.github.com/encode/starlette/pull/2697)
***
**Full Changelog**: https://github.com/encode/starlette/compare/0.38.6...0.39.0
### [`v0.38.6`](https://redirect.github.com/encode/starlette/releases/tag/0.38.6): Version 0.38.6
[Compare Source](https://redirect.github.com/encode/starlette/compare/0.38.5...0.38.6)
#### Fixed
- Close unclosed `MemoryObjectReceiveStream` in `TestClient` [#​2693](https://redirect.github.com/encode/starlette/pull/2693).
***
**Full Changelog**: https://github.com/encode/starlette/compare/0.38.5...0.38.6
### [`v0.38.5`](https://redirect.github.com/encode/starlette/releases/tag/0.38.5): Version 0.38.5
[Compare Source](https://redirect.github.com/encode/starlette/compare/0.38.4...0.38.5)
#### Fixed
- Schedule `BackgroundTasks` from within `BaseHTTPMiddleware` [#​2688](https://redirect.github.com/encode/starlette/pull/2688).
This behavior was removed in 0.38.3, and is now restored.
***
**Full Changelog**: https://github.com/encode/starlette/compare/0.38.4...0.38.5
</details>
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Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| qwen/qwen3.6-35b-a3b | — | — | Merged security hotfix updating starlette from 0.38.4 to 0.40.0 on the hotfix/8.4 branch. Resolves CVE-2024-47874 DoS vulnerability in multipart/form-data parsing. Approved by two reviewers and passed CI. | |
| qwen3.6-35b-a3b-mtp-q6 | — | — | Merged to hotfix/8.4 branch, updating starlette from v0.38.4 to v0.40.0. This resolves CVE-2024-47874, a denial-of-service vulnerability in multipart/form-data processing. The security patch was reviewed and successfully integrated. | |
| qwen3.6-35b-a3b-mtp-q6 | — | — | Merged hotfix updating starlette to v0.40.0 to resolve CVE-2024-47874, a multipart/form-data denial-of-service vulnerability. Approved by maintainer and applied to the hotfix/8.4 branch. |
Update history
No update history recorded yet.
Related issues
| Issue | Project | State | Summary | Similarity |
|---|---|---|---|---|
| #5119 build(deps): update dependency starlette to v0.40.0 [security] (main) | snapcraft | merged | Merged dependency update upgrading starlette to v0.40.0 to resolve CVE-2024-47874, a denial-of-service vulnerability in multipart/form-data parsing. Approved by two reviewers with passing CI checks. | |
| #1181 build(deps): update dependency starlette to v0.47.2 [security] (hotfix/2.7) | craft-parts | merged | Merged automated upgrade of starlette from v0.45.3 to v0.47.2 to patch CVE-2025-54121, fixing a thread-blocking vulnerability during large uploads. Approved by two reviewers and merged into hotfix/2.7. | |
| #5118 build(deps): bump starlette from 0.38.5 to 0.40.0 | snapcraft | closed | Closed after approval to update starlette to 0.40.0, addressing a multipart/form-data DoS vulnerability. | |
| #1180 build(deps): update dependency starlette to v0.47.2 [security] (main) | craft-parts | merged | Merged automated update upgrading starlette from 0.45.3 to 0.47.2 to resolve CVE-2025-54121, preventing main thread blocking during large file uploads. Approved by two reviewers and merged to main. | |
| #350 build(deps): bump starlette | imagecraft | merged | Merged dependency update bumping starlette from v0.52.1 to v1.2.0 to resolve an OSV vulnerability. Approved by two reviewers and passed all CI checks prior to integration. | |
| #84 build(deps): bump starlette from 0.48.0 to 0.49.1 | debcraft | merged | Merged dependabot update to bump starlette from 0.48.0 to 0.49.1. The upgrade patches a FileResponse Range header security vulnerability and adds minor features. CI checks passed and reviewers approved the merge. | |
| #742 build(deps): update deps with freeze-requirements.sh | rockcraft | merged | Merged dependency update to starlette 0.41.0 using freeze-requirements.sh, resolving CVE-2024-47874 DoS vulnerability. Approved by two reviewers and passed all CI checks. | |
| #547 build(deps): add constraint for Starlette | starbase | merged | Merged a dependency update pinning Starlette to a version unaffected by the BadHost CVE. Approved by two reviewers and passing all CI checks, the change adds a version constraint to mitigate the vulnerability. | |
| #376 build(deps): add constraint for Starlette | craft-store | merged | Merged to pin Starlette and mitigate the BadHost CVE. Approved by two reviewers and passed CI checks. The change adds a version constraint to the indirect dependency, resolving the security vulnerability. | |
| #357 build(deps): bump cryptography and starlette | imagecraft | merged | Merged dependency update bumping cryptography to 49.0.0 and adding starlette>=1.3.1 to resolve OSV security vulnerabilities. Approved by one reviewer and merged after passing required CI checks. |