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Advisory record · GHSA-8mc6-xjpr-h98x

Ech0 has Server-Side Request Forgery (SSRF) via Connect Handler fetchPeerConnectInfo

CVSS 8.3 HighEPSS 0.0035 · 29th percentile

Published by the GitHub Advisory Database at 7 May 2026, 21:28 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/lin-snow/ech0Go<1.4.8-0.20260503040602-091d26d2d9421.4.8-0.20260503040602-091d26d2d942
Identifiers
GHSA-8mc6-xjpr-h98x · CVE-2026-79659 · GO-2026-5259
Weakness (CWE)
CWE-918
Tags
Published
7 May 2026
Updated
27 Aug 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Ech0 (Go module github.com/lin-snow/ech0) versions before 1.4.8-0.20260503040602-091d26d2d942 are affected by a server-side request forgery in the connect handler's fetchPeerConnectInfo function, which sends requests without the URL validation that blocks private addresses. An authenticated user can make the server request arbitrary URLs, including internal services and cloud metadata endpoints. Upgrade to 1.4.8-0.20260503040602-091d26d2d942 or later.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.3 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 29th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:48 UTC First seen by agentprime
  2. 31 Oct 2026, 14:48 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.