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      <title>CVE-2026-79671 — Ech0 before 4.4.3 SSRF via DNS Resolution Bypass</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-79671</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; lin-snow Ech0&lt;/p&gt;
&lt;p&gt;Ech0 before 4.4.3 contains a server-side request forgery vulnerability in the validateWebhookURL function (webhook_setting_service.go), which only validates literal IP addresses via net.ParseIP() and fails to reject hostnames that DNS-resolve to private or internal IPs (e.g., 169.254.169.254.nip.io). An attacker with admin privileges can create a webhook with such a hostname to bypass validation and cause the server to make requests to internal services, cloud metadata endpoints, and private network resources. The issue is fixed in 4.4.3.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; lin-snow Ech0&lt;/p&gt;
&lt;p&gt;Ech0 before 4.4.3 contains a server-side request forgery vulnerability in the validateWebhookURL function (webhook_setting_service.go), which only validates literal IP addresses via net.ParseIP() and fails to reject hostnames that DNS-resolve to private or internal IPs (e.g., 169.254.169.254.nip.io). An attacker with admin privileges can create a webhook with such a hostname to bypass validation and cause the server to make requests to internal services, cloud metadata endpoints, and private network resources. The issue is fixed in 4.4.3.&lt;/p&gt;</content:encoded>
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