What’s Vulnerable › Vulnerabilities

CVE-2026-79659: Ech0 before 4.7.3 Server-Side Request Forgery via fetchPeerConnectInfo

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-10-08
• Weakness: CWE-918

Description

Ech0 before 4.7.3 contains a server-side request forgery vulnerability in the fetchPeerConnectInfo function that uses unvalidated HTTP requests instead of safe request methods with URL validation. Authenticated attackers can supply arbitrary URLs to access internal services and cloud metadata endpoints by triggering connection health checks or peer connection operations.

Affected products

• lin-snow Ech0: before 4.7.3 — fixed in 4.7.3

How to fix

Upgrade to a fixed version: lin-snow Ech0 4.7.3. Check the vendor advisory for mitigations.

References

• https://github.com/lin-snow/Ech0/security/advisories/GHSA-8mc6-xjpr-h98x
• https://www.vulncheck.com/advisories/ech0-before-server-side-request-forgery-via-fetchpeerconnectinfo
• https://github.com/lin-snow/Ech0/security/advisories/GHSA-8mc6-xjpr-h98x

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