Java OpenJDK August 2026 Critical Patch Update

Hello Java customers!

We are happy to announce the latest August 2026 critical patch update release for the Microsoft Build of OpenJDK. Check our release notes page for details on fixes and enhancements or download and install the binaries today. The source code of our builds are now available on GitHub for further inspection:

• OpenJDK 25.0.4.1
• OpenJDK 21.0.12.1
• OpenJDK 17.0.20.1
• OpenJDK 11.0.32.1

Microsoft Build of OpenJDK specific updates

OpenJDK 25

• G1 can return unused committed heap to the OS during idle periods (time-based heap uncommit), controlled by the diagnostic G1UseTimeBasedHeapSizing flag (default enabled).

OpenJDK 21

• No Microsoft-specific updates for this release.

OpenJDK 17

• No Microsoft-specific updates for this release.

OpenJDK 11

• No Microsoft-specific updates for this release.

Summary of Upstream Updates

OpenJDK Vulnerability Advisory August 2026

OpenJDK 25

• List of fixes
• For further details, please refer to Oracle’s page on JDK25 consolidated release notes.

OpenJDK 21

• List of fixes
• For further details, please refer to Oracle’s page on JDK21 consolidated release notes.

OpenJDK 17

• List of fixes
• For further details, please refer to Oracle’s page on JDK17 consolidated release notes.

OpenJDK 11

• List of fixes
• For further details, please refer to Oracle’s page on JDK11 consolidated release notes.

OpenJDK 8

We continue to provide support on Azure and internally at Microsoft for OpenJDK 8 binaries of Eclipse Temurin built by the Eclipse Adoptium project. To facilitate its usage, we ship container images of OpenJDK 8 on top of Azure Linux and Ubuntu. Refer to our documentation.

• Download the latest Temurin build of OpenJDK 8

Questions?

Contact openjdk-support@microsoft.com.

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