CVE-2026-40347

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

5.3 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L                                    

Vulnerability 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.

Vulnerability Details

Published Date

April 15, 2026

Last Modified

April 24, 2026

CWE ID

CWE-400

Source

GitHub

Vendor

pip

Product

python-multipart

External References

https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj
https://github.com/Kludex/python-multipart/releases/tag/0.0.26
https://github.com/advisories/GHSA-mj87-hwqh-73pj

CVE-2026-40347

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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