SSRF in Lin-Snow Ech0
CVE-2026-79659
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 16.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/lin-snow/Ech0/security/advisories/GHSA-8mc6-xjpr-h98x (vendor-advisory)
- www.vulncheck.com/advisories/ech0-before-server-side-request-forgery-via-fetchp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-79659?
- CVE-2026-79659 is a high-severity vulnerability in Lin-Snow Ech0, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-08-25.
- How severe is CVE-2026-79659?
- High severity. CVSS v3 base score is 7.7 out of 10.