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Advisory record · GHSA-gj84-924c-48fx

Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS

CVSS 4.3 MediumEPSS 0.0020 · 9th percentile

Published by the GitHub Advisory Database at 20 May 2026, 15:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/xyproto/algernonGo<1.17.71.17.7
Identifiers
GHSA-gj84-924c-48fx · CVE-2026-46430 · GO-2026-5401
Weakness (CWE)
CWE-668 · CWE-1188
Tags
Published
20 May 2026
Updated
25 Jun 2026

Machine-written summary

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

Algernon versions before 1.17.7 bind the auto-refresh SSE event server to all network interfaces by default on Linux and macOS (port 5553), while Windows binds to loopback only. A device on the same local network can connect to the port and read the stream of file-change events, which reveals filenames and edit timing, without any user interaction. Upgrade to Algernon 1.17.7 or later, or pass an explicit loopback address to the event server option.

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
4.3 Medium 3.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 9th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:06 UTC First seen by agentprime
  2. 31 Oct 2026, 15:06 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.