CVE-2024-24762

python-multipart vulnerable to content-type header Regular expression Denial of Service

`python-multipart` is a streaming multipart parser for Python. When using form data, `python-multipart` uses a Regular Expression to parse the HTTP `Content-Type` header, including options. An attacker could send a custom-made `Content-Type` option that is very difficult for the RegEx to process, consuming CPU resources and stalling indefinitely (minutes or more) while holding the main event loop. This means that process can't handle any more requests, leading to regular expression denial of service. This vulnerability has been patched in version 0.0.7.

Affected

Kludex · tiangolo · encode · python-multipart · fastapi · starlette

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

1.52% chance of exploitation in the next 30 days, 74th percentile

Published

2024-02-05

Updated

2025-05-09

Proof-of-concept exploits (2)

• Kludex/python-multipart/security/advisories/GHSA-2jv5-9r88-3w3p
• advisories/GHSA-2jv5-9r88-3w3p

Security advisories

• Kludex/python-multipart/commit/20f0ef6b4e4caf7d69a667c54dff57fe467109a4
• encode/starlette/commit/13e5c26a27f4903924624736abd6131b2da80cc5
• tiangolo/fastapi/commit/9d34ad0ee8a0dfbbcce06f76c2d5d851085024fc
• andrew-d/python-multipart/blob/d3d16dae4b061c34fe9d3c9081d9800c49fc1f7a/multipart/multipa…

References

• CVE Record
• NVD entry