CVE-2026-79671
Medium · 5.5CVSS
5.5
EPSS
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Published
Aug 25, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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