CVSS 3.1
4.3 mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:NCVE-2026-46430
Medium (4.3). EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/xyproto/algernon 1.17.7.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 9% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-668, CWE-1188
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-gj84-924c-48fx | Go | github.com/xyproto/algernon | <1.17.7 | 1.17.7 |
| GO-2026-5401 | Go | github.com/xyproto/algernon | <1.17.7 | 1.17.7 |