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PatchSiren cyber security CVE debrief

CVE-2026-46411 halfgaar CVE debrief

CVE-2026-46411 is a vulnerability in FlashMQ, a MQTT broker/server designed for multi-CPU environments. Prior to version 1.26.2, authorized clients could exceed their permitted write buffer over-commit, triggering an internal safe-guard exception. This exception was not catchable, causing a server abort. The issue has been patched in version 1.26.2.

Vendor
halfgaar
Product
FlashMQ
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-10
Advisory published
2026-06-10
Advisory updated
2026-06-10

Who should care

Users of FlashMQ prior to version 1.26.2 should update to the patched version to prevent potential server crashes.

Technical summary

The vulnerability has a CVSS score of 6.5 and a severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. The weakness is classified as CWE-248.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update FlashMQ to version 1.26.2 or later.

Evidence notes

The CVE record and details can be found at [cve-org]. More information is available at [nvd].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46411 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46411

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46411 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46411

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.