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    <lastBuildDate>Mon, 28 Sep 2026 07:29:20 +0000</lastBuildDate>
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      <title>CVE-2026-40992 — Mail Auto-Configuration Does Not Enable SSL Hostname Verification</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-40992</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Spring Boot&lt;/p&gt;
&lt;p&gt;Spring Boot&amp;#39;s Mail auto-configuration does not enable hostname verification. Applications that set the relevant JavaMail property, such as spring.mail.properties.mail.smtp.ssl.checkserveridentity=true, are not affected.&lt;/p&gt;
&lt;p&gt;Affected versions:
Spring Boot 4.0.0 through 4.0.6; 3.5.0 through 3.5.14; 3.4.0 through 3.4.16.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Spring Boot&lt;/p&gt;
&lt;p&gt;Spring Boot&amp;#39;s Mail auto-configuration does not enable hostname verification. Applications that set the relevant JavaMail property, such as spring.mail.properties.mail.smtp.ssl.checkserveridentity=true, are not affected.&lt;/p&gt;
&lt;p&gt;Affected versions:
Spring Boot 4.0.0 through 4.0.6; 3.5.0 through 3.5.14; 3.4.0 through 3.4.16.&lt;/p&gt;</content:encoded>
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