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[threadx] ThreadX v6.5.1 is now available!
Hi everyone.

I have the pleasure of announcing the availability of Eclipse ThreadX version 6.5.1.202602. This service release represents another major step forward for our RISC-V support. It also introduces a brand-new Windows 64-bit port of ThreadX, which can be used to run the full regression test suite to validate new code contributions. Moreover, it includes many bug fixes and improvements across the whole ThreadX Suite.

Users of GUIX Studio will be happy to learn that the venerable application now scales properly on high-resolution screens (HighDPI support). An installer is available in the v6.5.1 release notes.

I also invite you to discover our new SampleX repository, which replaces the older demos and getting started guides. The selection is still a bit sparse for now, but our Google Summer of Code participants are busy fixing that! Feel free to pitch in as well.

Contributing organisations
This release includes code contributions by the following organisations:
10xEngineers, Advanced Electronics, Alibaba, Amazon, Bradford Space, Cadence Design Systems, Cloudflight, JBLopen, PR electronics, Quintauris, Rockwell Automation, T3S Solutions, Taktflow Systems, Volz Servos

Several independent developers also contributed code. Thanks to @alieissa-commits, @AmmarOkla12772, @EdouardMALOT, @hodcarrier, @howjmay, @MrNetic,@vb-linetco, and @Winstonllllai!

New Contributors
Our Q1 2026 release involved 11 brand-new contributors. We did even better this time with 18! Please join me in thanking @alieissa-commits, @AmmarOkla12772, @cpdpls, @EdouardMALOT, @hodcarrier, @howjmay, @ianstcdns, @jblanchard-jblopen, @kajteklau, @madsknielsen, @MrNetic, @mzgrebnak, @nhuvaoanh123, @Polarisru, @Ralino, @SeanHowsonAdvCo, @vb-linetco, and @Winstonllllai for their work on v6.5.1.


Release Overview

ThreadX
This release expands hardware platform support with major RISC-V improvements — including three new boards and the addition of support for the RISC-V Vector Extension (RVV) — and introduces native Win64 ports for both ThreadX and ThreadX SMP. It also delivers a significantly updated Xtensa port, QEMU-based automated CI for RISC-V, and several bug fixes for Cortex-M and RISC-V targets.

Vulnerabilities addressed:
None. You can access advisories for previously addressed vulnerabilities here.
https://github.com/eclipse-threadx/threadx/security/advisories

Full release notes:
https://github.com/eclipse-threadx/threadx/releases/tag/v6.5.1.202602_rel


NetX Duo
This release delivers substantial improvements to BSD socket support, significant advances in TLS/security with RSA-PSS and X.509 enhancements, and several targeted bug fixes across the networking and crypto stacks.

Vulnerabilities addressed:
CVE-2026-xxxxx — Cleanup path unconditionally calls fx_file_close() on unopened file.
https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wrwf-jf85-4549

Full release notes:
https://github.com/eclipse-threadx/netxduo/releases/tag/v6.5.1.202602_rel


USBX
This release delivers significant HID class improvements — including new host-sideprotocol APIs and several bug fixes — along with a control transfer parsing fix and general code quality improvements.

Vulnerabilities addressed:
None. You can access advisories for previously addressed vulnerabilities here.
https://github.com/eclipse-threadx/usbx/security/advisories

Full release notes:
https://github.com/eclipse-threadx/usbx/releases/tag/v6.5.1.202602_rel


FileX
This release delivers a targeted bug fix ensuring data integrity when formatting media, contributed by a new community member.

Vulnerabilities addressed:
None. You can access advisories for previously addressed vulnerabilities here.
https://github.com/eclipse-threadx/filex/security/advisories

Full release notes:
https://github.com/eclipse-threadx/filex/releases/tag/v6.5.1.202602_rel


LevelX
This release introduces an important performance improvement for NAND flash operations with the addition of opt-in lazy sector release, significantly reducing deletion complexity on large drives.

Vulnerabilities addressed:
None. You can access advisories for previously addressed vulnerabilities here.
https://github.com/eclipse-threadx/levelx/security/advisories

Full release notes:
https://github.com/eclipse-threadx/levelx/releases/tag/v6.5.1.202602_rel


GUIX
This release focuses on modernising GUIX Studio with a migration to Visual Studio 2022 and high-DPI support, while also introducing an error processing hook for custom RTOS bindings and delivering several bug fixes across both the GUIX runtime and GUIX Studio.

Vulnerabilities addressed:
None. You can access advisories for previously addressed vulnerabilities here.
https://github.com/eclipse-threadx/guix/security/advisories

Full release notes:
https://github.com/eclipse-threadx/guix/releases/tag/v6.5.1.202602_rel

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Of course, now that v6.5.1 is out there, work is starting on v6.5.2! Keep those pull requests coming! 

Best Regards,

Frédéric DESBIENS

Project Lead | Eclipse ThreadX  

Senior Manager — Embedded and IoT | Eclipse Foundation

Mastodon: @fdesbiens@xxxxxxxxxxxxxxxxxxxxx

Eclipse Foundation: The Community for Open Innovation and Collaboration

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