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      <title>CVE-2026-6691 — MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-6691</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; MongoDB Inc. MongoDB C Driver&lt;/p&gt;
&lt;p&gt;The MongoDB C Driver&amp;#39;s Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; MongoDB Inc. MongoDB C Driver&lt;/p&gt;
&lt;p&gt;The MongoDB C Driver&amp;#39;s Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.&lt;/p&gt;</content:encoded>
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