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      <title>CVE-2026-92543 — Docker Engine insecure-registry fallback via malicious DNS responses</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-92543</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Docker Engine, Moby&lt;/p&gt;
&lt;p&gt;Docker Engine classifies a registry hostname as insecure using an any-match DNS check. loadInsecureRegistries() injects 127.0.0.0/8 and ::1/128 as insecure CIDRs by default. isCIDRMatch resolves all of the hostname&amp;#39;s addresses and returns true if a single address is in the insecure CIDR list. Because the transport re-dials the hostname rather than the CIDR-matching address, a DNS answer set of one loopback IP plus a non-loopback attacker IP disables certificate verification and enables HTTP fallback for the registry connection.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Docker Engine, Moby&lt;/p&gt;
&lt;p&gt;Docker Engine classifies a registry hostname as insecure using an any-match DNS check. loadInsecureRegistries() injects 127.0.0.0/8 and ::1/128 as insecure CIDRs by default. isCIDRMatch resolves all of the hostname&amp;#39;s addresses and returns true if a single address is in the insecure CIDR list. Because the transport re-dials the hostname rather than the CIDR-matching address, a DNS answer set of one loopback IP plus a non-loopback attacker IP disables certificate verification and enables HTTP fallback for the registry connection.&lt;/p&gt;</content:encoded>
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