Vulnerability · Published Dec 2, 2024 · Assigned by GitHub_M
CVE-2024-53981python-multipart has a Denial of service (DoS) via deformation `multipart/form-data` boundary
High 7.5
In plain English
A high-severity resource allocation without limits in python-multipart from Kludex. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
python-multipart is a streaming multipart parser for Python. When parsing form data, python-multipart skips line breaks (CR \r or LF \n) in front of the first boundary and any tailing bytes after the last boundary. This happens one byte at a time and emits a log event each time, which may cause excessive logging for certain inputs. An attacker could abuse this by sending a malicious request with lots of data before the first or after the last boundary, causing high CPU load and stalling the processing thread for a significant amount of time. In case of ASGI application, this could stall the event loop and prevent other requests from being processed, resulting in a denial of service (DoS). This vulnerability is fixed in 0.0.18.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | python-multipart | no fix listed | DEBIAN-CVE-2024-53981 |
| Debian:13 | python-multipart | 0.0.20-1 | DEBIAN-CVE-2024-53981 |
| Debian:14 | python-multipart | 0.0.20-1 | DEBIAN-CVE-2024-53981 |
| PyPI | python-multipart | 0.0.18 | GHSA-59g5-xgcq-4qw3 |
| PyPI | python-multipart | 0.0.18 | PYSEC-2026-1851 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Kludex | python-multipart | < 0.0.18 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H