Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type_CVE-2026-57436

{
    "lastseen": "",
    "description": "Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, Nokogiri::XML::Document#root= validated only that the new root was a Nokogiri::XML::Node, allowing a DTD node to be set as the document root. The result is a heap use-after-free during garbage collection or finalization, leading to an invalid memory read or potentially a segfault. This vulnerability is fixed in 1.19.4.",
    "published": "2026-06-25T14:33:29.496Z",
    "modified": "2026-06-25T14:33:29.496Z",
    "type": "cve",
    "title": "Nokogiri: Possible Use-After-Free when setting `Document#root=` to an invalid node type",
    "source": "GitHub_M",
    "references": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-wjv4-x9w8-wm3h",
    "id": "CVE-2026-57436",
    "bulletinFamily": "",
    "cwe": [
        "CWE-416"
    ],
    "cvelist": null,
    "sourceData": "sparklemotion nokogiri < 1.19.4",
    "sourceHref": "",
    "cvss": {
        "score": 1.7,
        "severity": "LOW",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
        "version": "4.0"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nokogiri",
    "version": "< 1.19.4",
    "vendor": "sparklemotion",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}