CVE-2026-46430
Medium
Description
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.
SeverityMedium
CVSS4.3
Exploit probability—
ProductGithub.com/xyproto/algernon
PublishedMay 26, 2026
First seenMay 26, 2026
Weakness typeCWE-668CWE-668CWE-1188CWE-1188
How to fix
Update
- github.com/xyproto/algernon1.17.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/xyproto/algernonGo | v < 1.17.7 | 1.17.7 |
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