FlashMQ v1.14.0 was discovered to contain an assertion failure in the function PublishCopyFactory::getNewPublish, which occurs when the QoS value of the publish object is greater than 0.
https://www.flashmq.org/2024/06/17/flashmq-1-15-1-released/
https://github.com/songxpu/bug_report/blob/master/MQTT/FlashMQ/cve-2024-42644.md