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      <title>CVE-2026-66072 — RabbitMQ: Atom table exhaustion via stream `chunk_selector`</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-66072</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; rabbitmq-server&lt;/p&gt;
&lt;p&gt;RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.1, get_chunk_selector/1 calls binary_to_atom on the raw client-supplied &amp;lt;&amp;lt;&amp;#34;chunk_selector&amp;#34;&amp;gt;&amp;gt; property from post-auth subscribe and resolve_offset_spec frames, with no whitelist and no existing guard. An authenticated stream client with read access to any stream can crash the broker node. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol user with read access to at least one stream. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.1.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; rabbitmq-server&lt;/p&gt;
&lt;p&gt;RabbitMQ is a messaging and streaming broker. Prior to versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.1, get_chunk_selector/1 calls binary_to_atom on the raw client-supplied &amp;lt;&amp;lt;&amp;#34;chunk_selector&amp;#34;&amp;gt;&amp;gt; property from post-auth subscribe and resolve_offset_spec frames, with no whitelist and no existing guard. An authenticated stream client with read access to any stream can crash the broker node. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol user with read access to at least one stream. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, 4.2.6, and 4.3.1.&lt;/p&gt;</content:encoded>
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