Security Advisory

CVE-2026-42209

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-08 21:40:43

Last updated 2026-05-11 15:59:27

Assigner GitHub_M

CVSS score 6.5

State PUBLISHED

Description

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.1, a remote client with retained publish permission can crash the FlashMQ broker when both set_retained_message_defer_timeout and set_retained_message_defer_timeout_spread are configured to non-default values, resulting in denial of service. If anonymous retained publishing is allowed, no authentication is required; otherwise, the attacker needs the corresponding publish permission. This issue has been patched in version 1.26.1.

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