The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection_CVE-2026-7210

{
    "lastseen": "",
    "description": "`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.",
    "published": "2026-05-11T17:19:09.784Z",
    "modified": "2026-05-11T18:54:12.868Z",
    "type": "cve",
    "title": "The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection",
    "source": "PSF",
    "references": "https://mail.python.org/archives/list/[email protected]/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/\nhttps://github.com/python/cpython/pull/149023\nhttps://github.com/python/cpython/issues/149018",
    "id": "CVE-2026-7210",
    "bulletinFamily": "",
    "cwe": [
        "CWE-331"
    ],
    "cvelist": null,
    "sourceData": "Python Software Foundation CPython 0",
    "sourceHref": "",
    "cvss": {
        "score": 6.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "CPython",
    "version": "0",
    "vendor": "Python Software Foundation",
    "ai_description": "",
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    "ai_score": 0
}