OpenJDK 26.0.1

OpenJDK 26.0.1 is here — the first update release for JDK 26, delivering security patches, library updates, and runtime fixes. Here's the summary.

Release Overview

OpenJDK 26.0.1 (build 26.0.1+8) is a maintenance update for the Java SE 26 platform, released on April 21, 2026. This is a standard Critical Patch Update (CPU) release containing security fixes, library upgrades, and HotSpot improvements.

The next scheduled CPU is July 21, 2026. Upgrading to 26.0.1 is recommended for all production deployments.

Library Updates

• FreeType 2.14.1 and 2.14.2 — Client-libs component updated with the latest FreeType font rendering library, bringing improved font shaping and security fixes for the rasterizer.
• Libpng 1.6.54 — The PNG image library has been updated to address several image-processing edge cases and security hardening.
• IANA Time Zone Data 2025c, 2026a — Updated time zone data to reflect the latest geopolitical changes and daylight savings rules worldwide.

HotSpot VM Fixes

• NonNMethodCodeHeapSize crash — The VM could crash during initialization when NonNMethodCodeHeapSize was set too small and UseTransparentHugePages was enabled. The fix ensures graceful handling of small code heap configurations.
• CPUTimeCounters fix — Fixed a regression where CPUTimeCounters was creating a total counter for garbage collectors that don't support CPU time tracking, causing incorrect monitoring data.

Core Libraries

• GZIPInputStream performance regression — A performance regression introduced in an earlier update has been resolved. The fix restores original throughput levels for GZIP decompression workloads.

Upgrade Notes

OpenJDK 26.0.1 is a drop-in replacement for JDK 26.0.0. No code changes or recompilation is required. Binaries under the GPL are available from Oracle, Adoptium, and other OpenJDK vendors. Upgrade before the July 21 CPU to stay on a supported release.