CVEvulnerability
CVE-2026-40347
5.3 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-04-18
- Last modified
- 2026-10-26
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-400, CWE-834
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.
Affected configurations
• fastapiexpert python-multipart (< 0.0.26)
Related
References
- https://github.com/Kludex/python-multipart/releases/tag/0.0.26 Product, Release Notes
- https://github.com/Kludex/python-multipart/security/advisories/GHSA-mj87-hwqh-73pj Vendor Advisory