CVE-2026-8686

Summary

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.

Affected Software

Weaknesses

• CWE-125: CWE-125 Out-of-bounds read

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

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

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