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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
halfgaar FlashMQ affected
Version Status Constraints
< 1.26.2 affected —

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/halfgaar/FlashMQ/commit/29e08f7b97b6e3f96db923c2b6a260c47b49c195 cve-icon cve-icon
https://github.com/halfgaar/FlashMQ/releases/tag/v1.26.2 cve-icon cve-icon
https://github.com/halfgaar/FlashMQ/security/advisories/GHSA-g35r-265r-rxrh cve-icon cve-icon
History

Tue, 09 Jun 2026 23:30:00 +0000

Type Values Removed Values Added
Description 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.
Title FlashMQ: Client can trigger uncaught exception on FlashMQ 1.26.1 and older
Weaknesses CWE-248
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-09T23:01:33.212Z

Reserved: 2026-05-13T21:04:10.933Z

Link: CVE-2026-46411

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-10T00:16:53.407

Modified: 2026-06-10T00:16:53.407

Link: CVE-2026-46411

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-10T01:00:12Z

Weaknesses