cvedb.io
CVE-2026-40347
MEDIUM · CVSS 5.3
EPSS exploitation probability: 0%
Published 2026-04-18T00:16:38.520 · Last modified 2026-06-17T10:45:09.547

Summary

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 products

fastapiexpert — python-multipart

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.