Medium 6.5Published Jun 9, 2026

CVE-2026-46411FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older

Updated under an hour ago (Oct 27, 2026, 4:50 PM ET)

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It affects halfgaar FlashMQ. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-248
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jun 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

halfgaar FlashMQ halfgaar:flashmq (from the name)	before 1.26.2	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.