What’s Vulnerable › Vulnerabilities

CVE-2026-79671: Ech0 before 4.4.3 SSRF via DNS Resolution Bypass

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-08-31
• Weakness: CWE-918

Description

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 products

• lin-snow Ech0: before 4.4.3 — fixed in 4.4.3

How to fix

Upgrade to a fixed version: lin-snow Ech0 4.4.3. Check the vendor advisory for mitigations.

References

• https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69
• https://www.vulncheck.com/advisories/ech0-before-ssrf-via-dns-resolution-bypass
• https://github.com/lin-snow/Ech0/security/advisories/GHSA-r2x7-427f-rq69

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