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CVE-2026-24486

High

Description

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.

SeverityHigh
CVSS8.6
Exploit probability—
ProductFastapiexpert Python-multipart
PublishedJan 27, 2026
First seenJan 27, 2026
Weakness typeCWE-22Path traversal

How to fix

Update
  • fastapiexpert python-multipart0.0.22 or later
  • python-multipart0.0.22 or later
Vendor advisories

Affected products

ProductAffected versionsFixed in
fastapiexpert python-multipartv < 0.0.220.0.22
python-multipartPyPIv < 0.0.220.0.22

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