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    CVE-2026-40347

    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.

    Published:Apr 17, 2026
    Last Modified:Apr 24, 2026
    EPS:Apr 17, 2026
    EPSS Score:0.00019
    CVSS Score:5.3

    Affected Products

    Vendor
    Fastapiexpert
    Product
    Python-multipart
    Vendor
    Kludex
    Product
    Python-multipart

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High