CVE-2026-6210

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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:\u00a0\nfrom 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image.</p><p>When processing SVG marker references, the renderer retrieves a node by its <code>id</code> attribute and casts it to <code>QSvgMarker*</code> without verifying the node type. A non-marker element (such as a <code>&lt;line&gt;</code> element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between <code>QSvgLine</code> and <code>QSvgMarker</code>,\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).</p><p>This issue affects Qt SVG:&nbsp;\nfrom 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.</p>"}]}], "references": [{"url": "https://codereview.qt-project.org/c/qt/qtsvg/+/724887"}, {"url": "https://issues.oss-fuzz.com/issues/496327371"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "vectorString": "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"}}], "solutions": [{"lang": "en", "value": "Apply fix: https://codereview.qt-project.org/c/qt/qtsvg/+/724887", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Apply fix: <a href=\"https://codereview.qt-project.org/c/qt/qtsvg/+/724887\">https://codereview.qt-project.org/c/qt/qtsvg/+/724887</a>"}]}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-06T13:11:30.336334Z", "id": "CVE-2026-6210", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-06T13:11:44.674Z"}}]}}

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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:\u00a0\nfrom 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.", "supportingMedia": [{"type": "text/html", "value": "<p>A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image.</p><p>When processing SVG marker references, the renderer retrieves a node by its <code>id</code> attribute and casts it to <code>QSvgMarker*</code> without verifying the node type. A non-marker element (such as a <code>&lt;line&gt;</code> element) that references itself as a marker triggers an out-of-bounds heap read due to the object size difference between <code>QSvgLine</code> and <code>QSvgMarker</code>,\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).</p><p>This issue affects Qt SVG:&nbsp;\nfrom 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-843", "description": "CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-122", "description": "CWE-122 Heap-based Buffer Overflow"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.8", "versionStartIncluding": "6.7.0"}, {"criteria": "cpe:2.3:a:qt:qt:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.11.1", "versionStartIncluding": "6.9.0"}], "operator": "OR"}], "operator": "OR"}], "providerMetadata": {"orgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3", "shortName": "TQtC", "dateUpdated": "2026-07-29T08:59:56.543Z"}}}, "cveMetadata": {"cveId": "CVE-2026-6210", "state": "PUBLISHED", "dateUpdated": "2026-07-29T08:59:56.543Z", "dateReserved": "2026-04-13T12:16:27.416Z", "assignerOrgId": "a59d8014-47c4-4630-ab43-e1b13cbe58e3", "datePublished": "2026-05-06T11:59:01.727Z", "assignerShortName": "TQtC"}, "dataVersion": "5.2"}

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{"bugzilla": {"description": "Qt SVG: Qt SVG: Denial of Service via crafted SVG image", "id": "2467180", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467180"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-843", "details": ["A flaw was found in Qt SVG. A remote attacker could exploit a vulnerability by providing a specially crafted SVG image. This issue arises from incorrect handling of SVG marker references, where the software misinterprets data types, leading to memory access errors and an infinite loop. This can cause the application to crash, resulting in a denial of service (DoS)."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid processing untrusted SVG images with applications that use Qt SVG. Users should exercise caution when opening SVG files from unknown or suspicious sources. If possible, configure applications to restrict the loading or rendering of SVG content from untrusted origins. This operational control reduces the attack surface by preventing the vulnerable component from processing malicious input."}, "name": "CVE-2026-6210", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "qt6-qtsvg", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "qt5-qtsvg", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "qt5-qtsvg", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "qt5-qtsvg", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-06T11:59:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6210\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6210\nhttps://codereview.qt-project.org/c/qt/qtsvg/+/724887\nhttps://issues.oss-fuzz.com/issues/496327371"], "threat_severity": "Moderate"}

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