CVE-2026-40347 — Python-Multipart affected by Denial of Service via large multipart preamble or epilogue data
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 …
Published: 2026-04-17 · CVSS: 5.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7