[Development] [Announce] Security advisory: Uncontrolled Recursion and Use-After-Free vulnerabilities in Qt SVG module impact Qt

[Volker Hilsheimer]

Affected versions are Qt 6.7 and later for both CVEs.

Volker


> On 8 Oct 2025, at 09:18, Jan Grulich via Development <development at qt-project.org> wrote:
> 
> Hi,
> 
> Do these two CVEs also affect Qt5? Looking at the fixes and the code in Qt5 I would say they are easily backportable, but the code there is not 1:1. Can someone please confirm Qt5 is also affected?
> 
> Thank you.
> 
> Regards,
> Jan Grulich
> 
> pá 3. 10. 2025 v 16:48 odesílatel List for announcements regarding Qt releases and development via Announce via Development <development at qt-project.org> napsal:
>  Two vulnerabilities in Qt SVG module have been discovered. Uncontrolled recursion vulnerability has been assigned the CVE id CVE-2025-10728. Whereas Use-After-Free vulnerability has been assigned the CVE id CVE-2025-10729.
>  
> Uncontrolled recursion vulnerability in Qt SVG - CVE-2025-10728
> 
> Affected versions: From Qt 6.7.0 to 6.8.4 and from 6.9.0 to 6.9.2.
>  Impact: When the module renders a Svg file that contains a <pattern> element, it might end up rendering it recursively leading to stack overflow DoS.
>  CVSS 4.0 Score: 9.4
> 
> Mitigation: Ensure that all input to the Qt SVG module is only from trusted sources.
>  Solution: Apply the following patch or update to Qt 6.9.3 or 6.8.5
> Patches:
> dev: https://codereview.qt-project.org/c/qt/qtsvg/+/654200 
> Qt 6.9: https://codereview.qt-project.org/c/qt/qtsvg/+/670894 or https://download.qt.io/official_releases/qt/6.9/CVE-2025-10728-qtsvg-6.9.diff 
> Qt 6.8: https://codereview.qt-project.org/c/qt/tqtc-qtsvg/+/671537 or https://download.qt.io/official_releases/qt/6.8/CVE-2025-10728-qtsvg-6.8.diff
> 
> 
> Use-After-Free vulnerability in Qt SVG - CVE-2025-10729
> 
> Affected versions: From Qt 6.7.0 to 6.8.4 and from 6.9.0 to 6.9.2.
>  Impact: When the module parses a <pattern> node which is not a child of a structural node, the node gets deleted after creation but might be accessed later leading to a use after free.
>  CVSS 4.0 Score: 9.4
>  Mitigation: Ensure that all input to the Qt SVG module is only from trusted sources.
>  Solution: Apply the following patch or the patch attached or update to Qt 6.9.3 or 6.8.5
> Patches:
> dev: https://codereview.qt-project.org/c/qt/qtsvg/+/675562 
> Qt 6.9: https://codereview.qt-project.org/c/qt/qtsvg/+/676501 or https://download.qt.io/official_releases/qt/6.9/CVE-2025-10729-qtsvg-6.9.diff 
> Qt 6.8: https://codereview.qt-project.org/c/qt/tqtc-qtsvg/+/676621 or https://download.qt.io/official_releases/qt/6.8/CVE-2025-10729-qtsvg-6.8.diff
> ______________________
> Tuukka Kettunen
> Senior Manager, Technical Support, Customer Engineering
>            
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