Devices / Makers & open firmware / Zephyr Embedded RTOS

Zephyr Embedded RTOS firmware

critical fix

Latest firmware: 4.4.2
Released: Aug 7, 2026
Category: Makers & open firmware
Last checked: Sep 14, 2026

How to update the Zephyr Embedded RTOS

Read the release notes first — firmware changes can require re-doing your config or calibration.
Use the project's own installer where it has one: a web flasher over USB, or an over-the-air update in its web UI.
Otherwise build or download the binary for your exact board from the releases page — the wrong board file will not boot.
Keep the previous firmware image and your config backed up so you can roll back.

Always download firmware from the manufacturer or project itself. Firmwarely links out; it never hosts firmware.

What changed

This is a bugfix release for Zephyr 4.4.1. ## Security Vulnerability Related * [CVE-2026-7007](https://www.cve.org/CVERecord?id=CVE-2026-7007) Division by zero in Zephyr ext2 superblock parsing allows DoS via crafted filesystem image * [CVE-2026-8023](https://www.cve.org/CVERecord?id=CVE-2026-8023)…

Manufacturer release notes ↗

Version history

4.4.2

Aug 7, 2026

FAQ

How do I update the Zephyr Embedded RTOS?

See the step-by-step above. Follow the project's release page for the flashing or OTA procedure. Many maker devices update from a web installer or the project's desktop app.

How does Firmwarely know when there's a new version?

Every night we read the manufacturer's official release page for the Zephyr Embedded RTOS and record the version, date and changelog. If anything changed, subscribers watching this device get an email.

Is this an official Zephyr page?

No. Firmwarely is independent. Device and brand names belong to their manufacturers; always download firmware from the official source.