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CVE-2026-8686 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.1 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CNA: AMZNCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-032-aws/	AMZN	Vendor Advisory
https://github.com/FreeRTOS/coreMQTT/releases/tag/v5.0.1	AMZN	Release Notes
https://github.com/FreeRTOS/coreMQTT/security/advisories/GHSA-6qh9-r6jp-2wxc	AMZN	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-125	Out-of-bounds Read	AMZN

Affected Products

Product	Versions
freertos coremqtt	5.0.0
CPE cpe:2.3:a:freertos:coremqtt:5.0.0:::::::* Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	AMZN
Jun 17, 2026	CVE Modified	CISA-ADP
May 19, 2026	Initial Analysis	[email protected]
May 15, 2026	New CVE Received	AMZN