CVE-2026-107457

EUVD-2026-115111
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
QtCNA
2.3 LOW
NETWORK
LOW
NONE
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:U/V:X/RE:L/U:Green
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
qtqt
5.12.0 ≤
𝑥
≤ 6.8.8
CNA
qtqt
6.9.0 ≤
𝑥
≤ 6.11.2
CNA
Common Weakness Enumeration
References
https://codereview.qt-project.org/c/qt/qtmqtt/+/762286
https://wiki.qt.io/List_of_known_vulnerabilities_in_Qt_products#CVE-2026-107457: