v4.2.3.1

Next generation Telemetry Agent for Logs, Metrics and Traces.

February 20, 2026

KNOWLEDGE BASE

Release Notes v4.2.3.1

Fluent Bit is a Fast and Lightweight Data Processor and Forwarder for Linux, BSD, Windows and macOS. We are proud to announce the availability of Fluent Bit v4.2.3.1.

Below is a detailed list of changes included in this release…

What’s new ?

Fluent Bit v4.2.3.1 is a targeted hotfix release that corrects the Docker image build to install only the minimum required components.


Core


  • dockerfiles: install minimum components only, avoiding includeRecommended packages to reduce image size and attack surface

Libraries

  • No bundled library upgrades in this release.

Plugins

  • No plugin changes in this release.

Contributors

On every release, there are many people involved doing contributions to different areas like bug reporting, troubleshooting, documentation and coding, without these contributions from the community, the project won’t be the same and won’t be in the good shape that it is now. So THANK YOU! to everyone who takes part of this journey!

Join us

We want to hear about you, our community is growing, and you can be part of it!, you can contact us at:

Latest Version

New release on July 3, 2026

Fluent Bit v5.0.9 is out!

Check out the Release Notes, read the Updated Documentation or jump directly to the Downloads Section.

We are part of a wide community, no vendor lock-in.