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      <title>CVE-2021-32040 — Large aggregation pipelines with a specific stage can crash mongod under default configuration</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2021-32040</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; MongoDB Inc. MongoDB Server, mongodb&lt;/p&gt;
&lt;p&gt;It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16.&lt;/p&gt;
&lt;p&gt;Workaround: &amp;gt;= v4.2.16 users and all v4.4 users can add the --setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; MongoDB Inc. MongoDB Server, mongodb&lt;/p&gt;
&lt;p&gt;It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16.&lt;/p&gt;
&lt;p&gt;Workaround: &amp;gt;= v4.2.16 users and all v4.4 users can add the --setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.&lt;/p&gt;</content:encoded>
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