CVE-2025-62723: Flashmq

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.23.2, any authenticated user can create sessions and have them collect QoS messages. When not sent to a client, these are then not released upon (eventual) session expiration. Version 1.23.2 fixes the issue.

Affected products

• Flashmq Flashmq: before 1.23.2 (fixed in 1.23.2)

Published 2025-10-24. Last modified 2026-10-08.