CVE-2024-24762
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.51%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
`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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.51% probability · 73th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-1333
- Affected
- fastapiexpert/python-multipart
- Source
- security-advisories@github.com
References
- https://github.com/Kludex/python-multipart/commit/20f0ef6b4e4caf7d69a667c54dff57fe467109a4Patch
- https://github.com/Kludex/python-multipart/security/advisories/GHSA-2jv5-9r88-3w3pExploit, Vendor Advisory
- https://github.com/andrew-d/python-multipart/blob/d3d16dae4b061c34fe9d3c9081d9800c49fc1f7a/multipart/multipart.py#L72-L74Product
- https://github.com/encode/starlette/commit/13e5c26a27f4903924624736abd6131b2da80cc5Patch
- https://github.com/encode/starlette/security/advisories/GHSA-93gm-qmq6-w238Broken Link
- https://github.com/tiangolo/fastapi/commit/9d34ad0ee8a0dfbbcce06f76c2d5d851085024fcPatch
- https://github.com/tiangolo/fastapi/releases/tag/0.109.1Product
- https://github.com/tiangolo/fastapi/security/advisories/GHSA-qf9m-vfgh-m389Broken Link
- https://github.com/Kludex/python-multipart/commit/20f0ef6b4e4caf7d69a667c54dff57fe467109a4Patch
- https://github.com/Kludex/python-multipart/security/advisories/GHSA-2jv5-9r88-3w3pExploit, Vendor Advisory
- https://github.com/andrew-d/python-multipart/blob/d3d16dae4b061c34fe9d3c9081d9800c49fc1f7a/multipart/multipart.py#L72-L74Product
- https://github.com/encode/starlette/commit/13e5c26a27f4903924624736abd6131b2da80cc5Patch
- https://github.com/encode/starlette/security/advisories/GHSA-93gm-qmq6-w238Broken Link
- https://github.com/tiangolo/fastapi/commit/9d34ad0ee8a0dfbbcce06f76c2d5d851085024fcPatch
- https://github.com/tiangolo/fastapi/releases/tag/0.109.1Product
- https://github.com/tiangolo/fastapi/security/advisories/GHSA-qf9m-vfgh-m389Broken Link
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.