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.
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from MQTT v5.0 Deserialization Fault in core MQTT","CVE":"CVE-2026-8686","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"8686","Ordinal":"1","NoteData":"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.\n\n\n\nTo remediate this issue, users should upgrade to v5.0.1.","Type":"Description","Title":"DoS from MQTT v5.0 Deserialization Fault in core MQTT"}]}}}