Bug 2459381 (CVE-2026-40347) - CVE-2026-40347 python-multipart: Python-Multipart: Denial of Service via crafted multipart/form-data requests
Summary: CVE-2026-40347 python-multipart: Python-Multipart: Denial of Service via craf...
Keywords:
Status: NEW
Alias: CVE-2026-40347
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-18 01:01 UTC by OSIDB Bzimport
Modified: 2026-04-20 13:39 UTC (History)
62 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-18 01:01:28 UTC
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.


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