CVE-2026-8686CRITICAL 9.1EPSS p30.4%

CVE-2026-8686CVE-2026-8686

Description

Missing bounds validation in the MQTT v5.0 property parser in coreMQTT before 5.0.1 allows an MQTT broker to cause a denial of service by sending a crafted packet. To remediate this issue, users should upgrade to v5.0.1.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS0.39% probability of exploitation · percentile 30.4% · 2026-06-19T12:03:05Z
Published2026-05-15
Last modified2026-05-19

Underlying weaknesses· 1

CWE-125

References

  1. https://aws.amazon.com/security/security-bulletins/2026-032-aws/
  2. https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1
  3. https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc

1

TypeTargetConfidenceTier
WeaknessOut-of-bounds Readcwe-1250%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.