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CVE-2026-40347

5.3 medium SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · fastapiexpertNVD modified 2026-10-26 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:fastapiexpert:python-multipart:*:*:*:*:*:python:*:*

References 2