Memory Corruption Vulnerability in Qt MQTT Module Affecting QMqttClient
CVE-2026-107457

2.3LOW

Key Information:

Vendor

Qt

Status
Qt
Vendor
CVE Published:
2 November 2026

What is CVE-2026-107457?

A memory corruption issue has been identified in the QMqttClient class of the Qt MQTT module. This vulnerability manifests under specific MQTT 5 connection settings between clients and servers, where improper handling may lead to corruption of memory. As a result, affected applications could experience instability and crashes, posing a risk during MQTT operations. It is critical for developers using this module to assess their implementations and apply the necessary patches to mitigate this risk.

Affected Version(s)

Qt 5.12.0 <= 6.8.8

Qt 6.9.0 <= 6.11.2

Qt 0 < 5.12.0

References

https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_pr...
vendor-advisory
https://codereview.qt-project.org/c/qt/qtmqtt/+/762286
patch

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.