Vulnerability · Published Oct 24, 2025 · Assigned by GitHub_M
CVE-2025-62723FlashMQ does not release memory of queued QoS messages
Medium 4.3
In plain English
A medium-severity security flaw in FlashMQ from halfgaar. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 72.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 (as reported)
Weakness: CWE-772 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
References
- https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-7mhp-22q4-r6vv x_refsource_CONFIRM
- https://github.com/halfgaar/FlashMQ/issues/154 x_refsource_MISC
- https://github.com/halfgaar/FlashMQ/commit/e86c49360ef4387440c97f591770cdb9284b4ee9 x_refsource_MISC