{"id":"CVE-2026-46430","aliases":["GHSA-gj84-924c-48fx","GO-2026-5401"],"url":"https://o3.security/vulnerability/CVE-2026-46430","summary":"Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS","details":"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":"2026-05-26T16:41:42.059Z","modified":"2026-08-12T03:51:40.476835450Z","cvss":{"score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"},"epss":{"score":0.00197,"percentile":0.098,"asOf":"2026-08-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/xyproto/algernon","fixedVersion":"1.17.7"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46430.json"},{"type":"ADVISORY","url":"https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46430"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:40.476835450Z"}}