CVE-2026-46411: Halfgaar Flashmq

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

FlashMQ is a MQTT broker/server, designed for multi-CPU environments. Prior to version 1.26.2, authorized clients have the ability to exceed the permitted over-commit of their write buffer and triggering an internal safe-guard exception. This exception was in a path that was not catchable, and therefore causes a server abort. This issue has been patched in version 1.26.2.

Affected products

• Halfgaar Flashmq: before 1.26.2 (fixed in 1.26.2)

Published 2026-06-10. Last modified 2026-07-23.