CVE-2026-40347 (Medium) detected in python_multipart-0.0.20-py3-none-any.whl

[mend-bolt-for-github]

CVE-2026-40347 - Medium Severity Vulnerability

Vulnerable Library - python_multipart-0.0.20-py3-none-any.whl

A streaming multipart parser for Python

Library home page: https://files.pythonhosted.org/packages/45/58/38b5afbc1a800eeea951b9285d3912613f2603bdf897a4ab0f4bd7f405fc/python_multipart-0.0.20-py3-none-any.whl

Path to dependency file: /OPENAPI-REST-API/swagger-client/python-flask/requirements.txt

Path to vulnerable library: /tmp/ws-ua_20260402123536_MTXLIM/python_EKDBTK/202604021249581/env/lib/python3.9/site-packages/python_multipart-0.0.20.dist-info

Dependency Hierarchy:

• connexion-3.3.0-py3-none-any.whl (Root Library)
  • ❌ python_multipart-0.0.20-py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 1f70e2feccb7006c8d32cc7d4fe62f5cf5e5c34d

Found in base branch: master

Vulnerability Details

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.

Publish Date: 2026-04-17

URL: CVE-2026-40347

CVSS 3 Score Details (5.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-04-17

Fix Resolution: python-multipart - 0.0.26

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