Source: starlette
Version: 0.46.1-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for starlette.

CVE-2025-54121[0]:
| Starlette is a lightweight ASGI (Asynchronous Server Gateway
| Interface) framework/toolkit, designed for building async web
| services in Python. In versions 0.47.1 and below, 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 the application can't
| accept new connections. The UploadFile code has a minor bug where
| instead of just checking for self._in_memory, the logic should also
| check if the additional bytes will cause a rollover. The
| vulnerability is fixed in version 0.47.2.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2025-54121
https://www.cve.org/CVERecord?id=CVE-2025-54121
[1] https://github.com/encode/starlette/security/advisories/GHSA-2c2j-9gv5-cj73 [2] https://github.com/encode/starlette/commit/9f7ec2eb512fcc3fe90b43cb9dd9e1d08696bec1
[3] https://github.com/encode/starlette/discussions/2927#discussioncomment-13721403

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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