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HiveMQ Release

HiveMQ 4.28.28 Maintenance Release

by HiveMQ TeamAUG 4, 2026

The HiveMQ team is pleased to announce the availability of HiveMQ 4.28.28.

This maintenance release for the 4.28 series includes the following improvements and bug fixes:

HiveMQ Enterprise MQTT Broker

  • Added the configurations of active HiveMQ extensions to the diagnostic archive, with secrets redacted.
  • Added Linux kernel sysctl values (network, memory, and file-descriptor settings) to the operating system information in the diagnostic archive when /proc/sys is readable.
  • Added a single-writer-watchdog.log file that reports potentially stalled single-writer tasks.
  • Added system-wide operating system metrics for context switches, interrupts, CPU frequency, load averages, process counts, and thread counts.
  • Fixed a regression that could reduce the TCP buffer size for bridge clients in some cases.
  • Fixed excessive warning logs that could clutter the log file when a gauge kept collecting metrics from a disk unmounted at runtime.
  • Fixed an issue where a broker cluster behaved as if a node with an older version remained after a rolling upgrade.
  • Fixed an issue where replica nodes kept queued messages for a shared subscription after the last client session for the subscription ended.

Have a great day, The HiveMQ Team