CVE-2026-46430

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.

PUBLISHED Reserved 2026-05-13 | Published 2026-05-26 | Updated 2026-05-26 | Assigner GitHub_M

Problem types

CWE-668: Exposure of Resource to Wrong Sphere

CWE-1188: Insecure Default Initialization of Resource

Product status

References

github.com/...gernon/security/advisories/GHSA-gj84-924c-48fx exploit

github.com/...gernon/security/advisories/GHSA-gj84-924c-48fx

cve.org (CVE-2026-46430)

nvd.nist.gov (CVE-2026-46430)

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