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    CVE-2026-39844

    NiceGUI is a Python-based UI framework. Prior to 3.10.0, Since PurePosixPath only recognizes forward slashes (/) as path separators, an attacker can bypass this sanitization on Windows by using backslashes (\) in the upload filename. Applications that construct file paths using file.name (a pattern demonstrated in NiceGUI's bundled examples) are vulnerable to arbitrary file write on Windows. This vulnerability is fixed in 3.10.0.

    Published:Apr 8, 2026
    Last Modified:Apr 15, 2026
    EPS:Apr 8, 2026
    EPSS Score:0.00067
    CVSS Score:5.9

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Zauberzeug
    Product
    Nicegui

    Exploits

    No exploit reference

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    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