HiveMQ 4.28.9 Maintenance Release

The HiveMQ team is pleased to announce the availability of HiveMQ 4.28.9.

This maintenance release for the 4.28 series includes the following improvements:

HiveMQ Enterprise MQTT Broker

• Reduced memory usage per client during connection establishment.
• Fixed an issue that could cause the broker to crash during shutdown in rare cases.
• Improved feedback for client connection password states on the Client Details view of the Control Center.

HiveMQ Data Hub

• Fixed an issue that could prevent the creation of JSON Schema files that start with Byte Order Mark (BOM) bytes such as UTF-16: 0xFEFF.

IMPORTANT: Java 21 will soon be required to run the HiveMQ Platform.

Since the HiveMQ 4.28 release in April 2024, Java 21 is recommended to run the HiveMQ Platform. For all HiveMQ versions released after April 2025, Java 21 will be required.

If you use the official HiveMQ container images, no action is required because these images have shipped with Java 21 since HiveMQ 4.28. If you do not run HiveMQ as a container, or you build your own container image, we recommend updating to Java 21 before the April 2025 deadline.

Have a great day, The HiveMQ Team