CVE-2026-24486: Fastapiexpert Python-Multipart

High severity, CVSS 7.5. EPSS: 2.2% chance of exploitation in the next 30 days.

Python-Multipart is a streaming multipart parser for Python. Prior to version 0.0.22, a Path Traversal vulnerability exists when using non-default configuration options `UPLOAD_DIR` and `UPLOAD_KEEP_FILENAME=True`. An attacker can write uploaded files to arbitrary locations on the filesystem by crafting a malicious filename. Users should upgrade to version 0.0.22 to receive a patch or, as a workaround, avoid using `UPLOAD_KEEP_FILENAME=True` in project configurations.

Affected products

• Fastapiexpert Python-Multipart: before 0.0.22 (fixed in 0.0.22)

Published 2026-01-27. Last modified 2026-08-07.