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    <lastBuildDate>Mon, 05 Oct 2026 08:22:15 +0000</lastBuildDate>
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      <title>CVE-2023-23931 — Cipher.update_into can corrupt memory in pyca cryptography</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2023-23931</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; pyca cryptography&lt;/p&gt;
&lt;p&gt;cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; pyca cryptography&lt;/p&gt;
&lt;p&gt;cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.&lt;/p&gt;</content:encoded>
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