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    <lastBuildDate>Wed, 07 Oct 2026 18:21:29 +0000</lastBuildDate>
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      <title>CVE-2026-39844 — NiceGUI has a Path Traversal in NiceGUI Upload Filename on Windows via Backslash Bypass of PurePosixPath Sanitization</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-39844</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; zauberzeug nicegui&lt;/p&gt;
&lt;p&gt;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&amp;#39;s bundled examples) are vulnerable to arbitrary file write on Windows. This vulnerability is fixed in 3.10.0.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; zauberzeug nicegui&lt;/p&gt;
&lt;p&gt;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&amp;#39;s bundled examples) are vulnerable to arbitrary file write on Windows. This vulnerability is fixed in 3.10.0.&lt;/p&gt;</content:encoded>
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