CVE-2025-62723

MediumCVSS 4.3

Published: 24/10/2025(UTC)Updated: 08/10/2026(UTC)Translated: 08/10/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Low risk

0.34%

25th percentile - higher than 25% of all known CVEs

Summary

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.

Risk Assessment

An attacker could intentionally create sessions and accumulate messages, potentially exhausting memory or other resources, causing broker unavailability.

Recommendation

Update FlashMQ to version 1.23.2 or later, which includes the fix, and monitor resource usage.

Other vulnerabilities in FlashMQ

CVE-2026-46411Medium
FlashMQ before version 1.26.2 allows authorized clients to exceed the permitted over-commit of their write buffer, triggering an internal safe-guard exception. This exception is in a path that cannot be caught, causing a server abort.

Original NVD description (English source)

Vulnerability data from NVD (NIST) · CISA KEV · EPSS