CVE-2026-46430
Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS
MEDIUM 4.3EPSS 0.2%
Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server bound to 0.0.0.0:5553 on Linux/macOS by default because the platform-dependent host default in engine/flags.go:39-46 set host = "" for non-Windows, and utils.JoinHostPort("", ":5553") resolves to ":5553". This vulnerability is fixed in 1.17.7.
- Affected
- xyproto · algernon
- CVSS v3.1 GITHUB
- 4.3 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N - EPSS
- 0.23% chance of exploitation in the next 30 days, 13th percentile
- Published
- 2026-05-26