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HiveMQ Release

HiveMQ 4.55.1 Maintenance Release

by HiveMQ TeamSEP 29, 2026

The HiveMQ team is pleased to announce the availability of HiveMQ 4.55.1.

This maintenance release for the 4.55 series includes the following improvements and bug fixes:

HiveMQ Enterprise MQTT Broker

  • Added com.hivemq.jvm.netty.* metrics to monitor the direct and heap memory that the Netty networking layer uses, which helps enforce hard memory limits in containerized deployments.
  • Added metrics to track message units, network traffic, and connections per MQTT listener:
    • com.hivemq.messages.incoming.message-units.count.<sanitizedListenerName>
    • com.hivemq.messages.outgoing.message-units.count.<sanitizedListenerName>
    • com.hivemq.networking.bytes.read.count.<sanitizedListenerName>
    • com.hivemq.networking.bytes.write.count.<sanitizedListenerName>
    • com.hivemq.networking.connections.<sanitizedListenerName>
  • Fixed a rare issue in which HiveMQ did not correctly return message IDs for clients whose queues contained in-flight messages.
  • Fixed an issue in which some messages from a shared subscription were incorrectly returned to the queue when HiveMQ polled messages with mixed QoS levels for delivery.
  • Fixed an issue where a diagnostic archive was reported as complete before the final ZIP file was merged, which could lead to failed or corrupted downloads.

HiveMQ Control Center

  • Updated the search functionality on all Data Hub pages to match the standard search behavior in the HiveMQ Control Center.
  • Improved the Dropped Messages Detail view to display up to 1000 entries per node for the last 72 hours.
  • Improved the Login attempt failed audit log event by removing the unknown username reason, which also appeared when the password was wrong.
  • Fixed an issue in the Data Hub views that displayed blank pages and left some script and module actions available when scripting was disabled.

HiveMQ Enterprise Security Extension

  • Added support for PostgreSQL versions 15 through 18 and aligned future certification with the PostgreSQL community support lifecycle.
  • Fixed token introspection requests being rejected by strict proxies by sending only the minimum headers required by the specification.

HiveMQ Enterprise Bridge Extension

  • Fixed an issue where bridge clients could keep reconnecting and forwarding messages after the extension was stopped, and could leave a subscribed session on the remote broker.

HiveMQ Enterprise Extension for MongoDB

  • Updated the recommended MongoDB instance version to 7.0 or higher.
  • Fixed an issue in which an uncaught exception stopped the extension from consuming messages when all messages in a batch had parsing errors.

Have a great day, The HiveMQ Team