← Database

CVE-2026-40347

MEDIUM CVSS: 5.3 Published: 2026-04-18 Modified: 2026-06-17

Description

Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted `multipart/form-data` requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.

Affected Platforms

Fastapiexpert Python-Multipart

Weakness Type

CWE-400, CWE-834

References