CVE-2026-22040: Emqx Nanomq

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, by generating a combined traffic pattern of high-frequency publishes and rapid reconnect/kick-out using the same ClientID and massive subscribe/unsubscribe jitter, it is possible to reliably trigger heap memory corruption in the Broker process, causing it to exit immediately with SIGABRT due to free(): invalid pointer. As of time of publication, no known patched versions are available.

Affected products

• Emqx Nanomq: before 0.24.6 (fixed in 0.24.6)

Published 2026-03-04. Last modified 2026-06-17.