CVE-2026-6210— Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash
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I. Basic Information for CVE-2026-6210
Vulnerability Information
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Vulnerability Title
Type confusion and heap-buffer-overflow in Qt SVG marker handling causing application crash
Source: NVD (National Vulnerability Database)
Vulnerability Description
A type confusion vulnerability in Qt SVG allows an attacker to cause an application crash via a crafted SVG image. When 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, followed by an endless recursion that bypasses the marker recursion guard through incorrect virtual dispatch. The result is an application crash (denial of service). This issue affects Qt SVG: from 6.7.0 before 6.8.8, from 6.9.0 before 6.11.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Qt SVG 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qt SVG是Qt公司的一个图形处理模块。 Qt SVG 6.7.0至6.8.8之前版本和6.9.0至6.11.1之前版本存在安全漏洞，该漏洞源于处理SVG标记引用时存在类型混淆，可能导致应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| The Qt Company | Qt | 6.7.0 ~ 6.8.8 | - |
II. Public POCs for CVE-2026-6210
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: Qt
- CVE-2025-14576
Possible QML code injection in VectorImage component - CVE-2025-12385
Improper validation of <img> tag size in Text component pars - CVE-2025-23050
Qt 缓冲区错误漏洞 - CVE-2025-6338
Possible denial of service with multiple incoming connection - CVE-2025-10729
Use-after-free vulnerability in Qt SVG qsvghandler.cpp allow
Same vendor: The Qt Company
- CVE-2025-14576
Possible QML code injection in VectorImage component - CVE-2025-12385
Improper validation of <img> tag size in Text component pars - CVE-2025-6338
Possible denial of service with multiple incoming connection - CVE-2025-10729
Use-after-free vulnerability in Qt SVG qsvghandler.cpp allow - CVE-2025-10728
Uncontrolled recursion in Qt SVG module
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