HarborGuard / CVE
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HIGHCVE-2026-8686Published Modified CNA AMZN

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

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 v4.0
8.7
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • FreeRTOS / coreMQTT
    5.0.0
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References