Crash when handling long CNAME response in net_CVE-2026-33811

{
    "lastseen": "",
    "description": "When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.",
    "published": "2026-05-07T19:41:19.285Z",
    "modified": "2026-05-08T14:25:43.896Z",
    "type": "cve",
    "title": "Crash when handling long CNAME response in net",
    "source": "Go",
    "references": "https://go.dev/issue/78803\nhttps://go.dev/cl/767860\nhttps://groups.google.com/g/golang-announce/c/qcCIEXso47M\nhttps://pkg.go.dev/vuln/GO-2026-4981",
    "id": "CVE-2026-33811",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Go standard library net 0\nGo standard library net 1.26.0-0",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
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            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "net",
    "version": "0",
    "vendor": "Go standard library",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}