CVE-2026-46430
Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-668 CWE-1188 |
| Vendor | xyproto |
| Product | algernon |
| Published | May 26, 2026 |
| Last Updated | May 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
xyproto / algernon
< 1.17.7