CVE-2024-47874

Name	CVE-2024-47874
Description	Starlette is an Asynchronous Server Gateway Interface (ASGI) framework/toolkit. Prior to version 0.40.0, 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. This Denial of service (DoS) vulnerability affects all applications built with Starlette (or FastAPI) accepting form requests. Verison 0.40.0 fixes this issue.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1085295

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
starlette (PTS)	bullseye	0.14.1-1	vulnerable
	bookworm	0.26.1-1	vulnerable
	trixie	0.41.3-2	fixed
	sid	0.46.1-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
starlette	source	(unstable)	0.41.0-1			1085295

Notes

[bookworm] - starlette <no-dsa> (Minor issue)
[bullseye] - starlette <postponed> (Minor issue; can be fixed in next update)
https://github.com/encode/starlette/security/advisories/GHSA-f96h-pmfr-66vw
https://github.com/encode/starlette/commit/fd038f3070c302bff17ef7d173dbb0b007617733 (0.40.0)