---
title: HiveMQ 4.55.1 Maintenance Release
description: The HiveMQ team is pleased to announce the availability of HiveMQ 4.55.1.
date: 2026-09-29
author: HiveMQ Team
tags:
  - HiveMQ Release
source: https://www.hivemq.com/changelog/hivemq-4-55-1-released
---

# HiveMQ 4.55.1 Maintenance Release

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](https://docs.hivemq.com/hivemq/latest/user-guide/monitoring.html#jvm-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](https://docs.hivemq.com/hivemq/latest/user-guide/monitoring.html#standard-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.

[Get HiveMQ 4.55.1 now](https://releases.hivemq.com/hivemq-4.55.1.zip)

Have a great day,
*The HiveMQ Team*