CVE-2026-40347

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.

CVSS Vector

References

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