Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash_CVE-2026-6210

{
    "lastseen": "",
    "description": "A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image.\n\n\n\nWhen processing SVG marker references, the renderer retrieves a node by its id attribute and casts it to QSvgMarker* without verifying the node type. A non-marker element (such as a <line> element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between QSvgLine and QSvgMarker,\n followed by an endless recursion that bypasses the marker recursion \nguard through incorrect virtual dispatch. The result is an application \ncrash (denial of service).\n\n\n\nThis issue affects Qt SVG: \nfrom 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.",
    "published": "2026-05-06T11:59:01.727Z",
    "modified": "2026-05-06T13:11:44.674Z",
    "type": "cve",
    "title": "Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash",
    "source": "TQtC",
    "references": "https://codereview.qt-project.org/c/qt/qtsvg/+/724887\nhttps://issues.oss-fuzz.com/issues/496327371",
    "id": "CVE-2026-6210",
    "bulletinFamily": "",
    "cwe": [
        "CWE-843",
        "CWE-122"
    ],
    "cvelist": null,
    "sourceData": "The Qt Company Qt 6.7.0\nThe Qt Company Qt 6.9.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Qt",
    "version": "6.7.0",
    "vendor": "The Qt Company",
    "ai_description": "Type confusion vulnerability in Qt SVG allowing an attacker to cause an application crash via a crafted SVG image",
    "ai_severity": "High",
    "ai_vendor": "The Qt Company",
    "ai_product": "Qt SVG",
    "ai_version": "6.7.0, 6.9.0",
    "ai_score": 8.7
}