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Generated remediation guidance and an executive summary. No account required.
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.
Use CWE-400, Fastapiexpert vendor hub and Python-Multipart product page to widen CVE-2026-40347 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2026-24486 and CVE-2024-24762 for nearby disclosures in the same product family.