GO-2026-5300 - Algernon: Auto-refresh SSE event server binds to all interfaces with Access-Control-Allow-Origin: * and…

Severity: info · Published 2026-06-25

Algernon: Auto-refresh SSE event server binds to all interfaces with Access-Control-Allow-Origin: * and no authentication in github.com/xyproto/algernon

Technologies: github.com/xyproto/algernon (Go). Vendors: Go.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
Informational severity, published 25 June 2026.
Which products and versions are affected?
github.com/xyproto/algernon (Go) SEMVER:introduced=0,fixed=1.17.7.
Is there a fix for This vulnerability?
Yes. github.com/xyproto/algernon (Go): upgrade to 1.17.7 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected?
Check whether you run github.com/xyproto/algernon (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/xyproto/algernon (Go): upgrade to 1.17.7 or later
    go get github.com/xyproto/algernon@v1.17.7

Affected products

  • github.com/xyproto/algernon (Go) SEMVER:introduced=0,fixed=1.17.7

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