CVE-2026-40347

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published4/18/2026

Last Modified4/18/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-400CWE-834

References

https://github.com/Kludex/python-multipart/releases/tag/0.0.26(security-advisories@github.com)

https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj(security-advisories@github.com)

IOC Correlations

No correlations recorded

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