Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS_CVE-2026-46430

{
    "lastseen": "",
    "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": "2026-05-26T16:41:42.059Z",
    "modified": "2026-05-26T16:41:42.059Z",
    "type": "cve",
    "title": "Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS",
    "source": "GitHub_M",
    "references": "https://github.com/xyproto/algernon/security/advisories/GHSA-gj84-924c-48fx",
    "id": "CVE-2026-46430",
    "bulletinFamily": "",
    "cwe": [
        "CWE-668",
        "CWE-1188"
    ],
    "cvelist": null,
    "sourceData": "xyproto algernon < 1.17.7",
    "sourceHref": "",
    "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",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "algernon",
    "version": "< 1.17.7",
    "vendor": "xyproto",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}