CVE-2026-46430

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.

CVSS v3.1

4.3 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1

4.3 MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.20% chance of exploitation in the next 30 days, 10th percentile

Published

2026-05-26

Proof-of-concept exploits (1)

• advisories/GHSA-gj84-924c-48fx

References

• CVE Record
• NVD entry

Related

• CVE-2026-46428
• CVE-2026-46431
• CVE-2026-46420
• CVE-2026-46432
• CVE-2026-46403
• CVE-2026-46439