CVE-2026-40347
MEDIUMPython-Multipart affected by Denial of Service via large multipart preamble or epilogue data
Title source: cnaDescription
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.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj
X_Refsource_Misc x_refsource_misc
https://github.com/Kludex/python-multipart/releases/tag/0.0.26
Scores
CVSS v3
5.3
EPSS
0.0035
EPSS Percentile
26.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-400
CWE-834
Status
published
Products (2)
Kludex/python-multipart
< 0.0.26
pypi/python-multipart
0 - 0.0.26PyPI
Published
Apr 18, 2026
Tracked Since
Apr 18, 2026