Dashboard / CVE-2026-40347

CVE-2026-40347

MEDIUM
MEDIUM Priority: 0.02 BB Relevance: 71/100
Published: 2026-04-18 Modified: 2026-10-26 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: None
I: None
A: Low

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.

Weakness Classification (2)

Affected Software (1)

VendorProductVersion
fastapiexpert python-multipart < 0.0.26

References & Advisories (2)

Bug Bounty Relevance

71 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

5.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploitation Probability

0.35%
Raw Score 0.003510
Percentile 28.7%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00351
2026-10-28
0.00351

Intelligence Sources

nvd ref →

External Links