CVE-2026-79671
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
ProductGithub.com/lin-snow/ech0
PublishedAug 25, 2026
First seenAug 25, 2026
Weakness typeCWE-918Server-side request forgery (SSRF)
How to fix
Update
- github.com/lin-snow/ech04.4.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/lin-snow/ech0Go | v < 4.4.3, No range specified | 4.4.3 |
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