Algernon: Race Condition in handle() shared LState_CVE-2026-43981

{
    "lastseen": "",
    "description": "Algernon is a small self-contained pure-Go web server. Prior to 1.17.6, in engine/luahandler.go, the sync.RWMutex protecting LoadCommonFunctions is released before L.Push() and L.PCall() execute. Since gopher-lua's LState is explicitly not goroutine-safe, concurrent requests race on the shared state causing Lua VM corruption. The Go race detector confirms this immediately under modest concurrency (ab -n 1000 -c 100). This vulnerability is fixed in 1.17.6.",
    "published": "2026-05-26T16:31:55.696Z",
    "modified": "2026-05-26T16:31:55.696Z",
    "type": "cve",
    "title": "Algernon: Race Condition in handle() shared LState",
    "source": "GitHub_M",
    "references": "https://github.com/xyproto/algernon/security/advisories/GHSA-rr2f-4wrm-h6rg\nhttps://github.com/xyproto/algernon/issues/172",
    "id": "CVE-2026-43981",
    "bulletinFamily": "",
    "cwe": [
        "CWE-362"
    ],
    "cvelist": null,
    "sourceData": "xyproto algernon < 1.17.6",
    "sourceHref": "",
    "cvss": {
        "score": 8.2,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "algernon",
    "version": "< 1.17.6",
    "vendor": "xyproto",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}