# CVE-2026-105923: Qt VectorImage integer overflow and null-pointer dereference

Source: https://junglewise.ai/threats/cve-2026-105923-a-malicious-svg-can-trigger-an-integer-overflow-which-in-turn  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-105923 · Severity: info · Published 2026-10-21

Qt's VectorImage QML Type can be triggered by a malicious SVG file to experience an integer overflow followed by a null-pointer dereference, potentially causing application crashes. An attacker could exploit this by providing a crafted SVG to any application using Qt's vector image rendering, resulting in a denial of service.

Technologies: [Qt](https://junglewise.ai/threats/technologies/qt-qt). Vendors: [Qt](https://junglewise.ai/threats/vendors/qt).

## Quick answers

**Is CVE-2026-105923 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105923 being exploited in the wild.

**How severe is CVE-2026-105923?** Informational severity, published 21 October 2026.

**Which products and versions are affected?** Qt <UNKNOWN>.

**Is there a fix for CVE-2026-105923?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-105923 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-105923?** Check whether you run Qt at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An integer overflow in the VectorImage QML Type when processing SVG files leads to a null-pointer dereference. The vulnerability is triggered when a malicious SVG file is parsed and rendered. The attack requires no authentication or special privileges and can be exploited via network delivery of a crafted SVG file to an application using the vulnerable component.

## Affected products

- Qt Qt <UNKNOWN>

## References

- [https://codereview.qt-project.org/c/qt%2Fqtbase/+/762279](https://codereview.qt-project.org/c/qt%2Fqtbase/+/762279)
- [https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products](https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products)

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