CVE-2026-107457Memory corruption vulnerability in QMqttClient impacts Qt MQTT

Description

A memory corruption vulnerability in the QMqttClient class of the Qt MQTT module. Under certain MQTT 5 connection settings between client and server, QMqttClient may corrupt memory, which can cause the application to crash.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107457: vendor-advisory
• https://codereview.qt-project.org/c/qt/qtmqtt/+/762286 patch