CVE-2026-8686 HIGH

CVE-2026-8686: DoS from MQTT v5.0 Deserialization Fault in core MQTT

Vendor Freertos
Product coreMQTT
Weakness CWE-125
Published May 15, 2026
Last update May 15, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 15, 2026 CVE published
May 15, 2026 Record updated