CVE-2026-46411 MEDIUM

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

Vendor Halfgaar
Product FlashMQ
Weakness CWE-248
Published June 9, 2026
Last update June 10, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 10, 2026 Record updated