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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| qt | Qt | 5.12.0 – ≤ 6.8.8, 6.9.0 – ≤ 6.11.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | qt6 +3 | 6.12.0-1.hum1 | RHSA-2026:89193 |
Advisories 1
- RHSA-2026:89193 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026