CVE-2026-33638: GO-2026-4838 - Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint in github.com/lin-snow/ech0

CVE-2026-33638 · Severity: low · CVSS 3.1 · Published 2026-03-26

Ech0 authenticated user-list exposed data via public `/api/allusers` endpoint in github.com/lin-snow/ech0

Technologies: github.com/lin-snow/ech0 (Go). Vendors: Go.

Quick answers

Is CVE-2026-33638 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-33638 being exploited in the wild.
How severe is CVE-2026-33638?
Low severity, with a CVSS score of 3.1, published 26 March 2026.
Which products and versions are affected?
github.com/lin-snow/ech0 (Go) SEMVER:introduced=0,fixed=1.4.8-0.20260322121226-acbf1fd71011.
Is there a fix for CVE-2026-33638?
Yes. github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260322121226-acbf1fd71011 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-33638?
Check whether you run github.com/lin-snow/ech0 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/lin-snow/ech0 (Go): upgrade to 1.4.8-0.20260322121226-acbf1fd71011 or later
    go get github.com/lin-snow/ech0@v1.4.8-0.20260322121226-acbf1fd71011

Affected products

  • github.com/lin-snow/ech0 (Go) SEMVER:introduced=0,fixed=1.4.8-0.20260322121226-acbf1fd71011

Identifiers

  • CVE-2026-33638
  • GHSA-m983-7426-5hrj
  • GO-2026-4838

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