# CVE-2026-19395: Qt for MCUs Text element denial of service with malformed img tag

Source: https://junglewise.ai/threats/cve-2026-19395-in-qt-for-mcus-a-text-element-that-displays-styled-text-halts-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-05. Updated: 2026-10-05  
License: CC BY 4.0 with a link back

CVE-2026-19395 · Severity: info · Published 2026-10-05

Qt for MCUs is an embedded UI framework for microcontroller devices. A specially crafted HTML img tag with an empty attribute value in styled text can crash the device, causing a complete service outage that requires manual restart.

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

## Quick answers

**Is CVE-2026-19395 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19395 being exploited in the wild.

**How severe is CVE-2026-19395?** Informational severity, published 5 October 2026.

**Which products and versions are affected?** Qt Qt for MCUs.

**Is there a fix for CVE-2026-19395?** 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-2026-19395 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-19395?** Check whether you run Qt for MCUs. 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

A malformed img tag in styled text passed to a Text element triggers an error in the text parser's validation logic. The parser passes an empty attribute value to an internal check that requires non-empty values, causing the check to fail and invoke the default error handler, which halts the device. This is a denial-of-service condition affecting embedded deployments.

## Affected products

- Qt Qt for MCUs

## References

- [https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products](https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products)