CVE-2026-79671
5.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Summary
Ech0 through 4.2.1 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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| lin-snow | Ech0 | 0 < 4.4.3 | affected |
| lin-snow | Ech0 | 4.4.3 | unaffected |
Weaknesses
- CWE-918: Server-Side Request Forgery (SSRF)
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
Feedback
Was this page helpful?
Glad to hear it! Please tell us how we can improve.
Sorry to hear that. Please tell us how we can improve.