CVE-2026-42209

Published May 8th, 2026

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CVSS v3

6.5

MEDIUM

CVSS v2

N/A

Affected

PROJECT

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.

halfgaar/FlashMQ

FlashMQ is a fast light-weight MQTT broker/server, designed to take good advantage of multi-CPU environments

GitHub

240