{"id":"CVE-2026-46430","state":"PUBLISHED","title":"Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS","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.","publishedAt":"2026-05-26T16:41:42.059Z","updatedAt":"2026-05-26T18:57:12.882Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["xyproto algernon"],"affected":[{"vendor":"xyproto","product":"algernon","versions":[{"version":"< 1.17.7","status":"affected"}]}],"references":["https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx"],"weaknesses":["CWE-668","CWE-1188"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46430.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46430","state":"PUBLISHED","datePublished":"2026-05-26T16:41:42.059Z","dateUpdated":"2026-05-26T18:57:12.882Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-13T22:18:22.830Z"},"containers":{"cna":{"title":"Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"xyproto","product":"algernon","versions":[{"version":"< 1.17.7","status":"affected"}]}],"references":[{"url":"https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx","name":"https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-668","lang":"en","description":"CWE-668: Exposure of Resource to Wrong Sphere","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1188","lang":"en","description":"CWE-1188: Insecure Default Initialization of Resource","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-26T16:41:42.059Z"},"source":{"advisory":"GHSA-gj84-924c-48fx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-26T18:57:07.427124Z","id":"CVE-2026-46430","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-26T18:57:12.882Z"}}]}}}