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      <title>CVE-2024-5642 — Buffer overread when using an empty list with SSLContext.set_npn_protocols()</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2024-5642</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Python Software Foundation CPython&lt;/p&gt;
&lt;p&gt;CPython 3.9 and earlier doesn&amp;#39;t disallow configuring an empty list (&amp;#34;[]&amp;#34;) for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Python Software Foundation CPython&lt;/p&gt;
&lt;p&gt;CPython 3.9 and earlier doesn&amp;#39;t disallow configuring an empty list (&amp;#34;[]&amp;#34;) for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).&lt;/p&gt;</content:encoded>
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