CVE-2026-46411

FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older

CVSS 6.5 MEDIUMEPSS 0.3%CWE-248

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.5EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

09 Jun 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

halfgaar · FlashMQ

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References

https://github.com/halfgaar/FlashMQ/commit/29e08f7b97b6e3f96db923c2b6a260c47b49c195 https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.2 https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-g35r-265r-rxrh