Qt Blog

Qt Creator 20.0.1 released

eike.ziller@qt.io (Eike Ziller) — Thu, 30 Jul 2026 09:31:12 GMT

We are happy to announce the release of Qt Creator 20.0.1!

The release improves tool detection and the default session directory for chats in the AI Agent Client Protocol integration, fixes various issues with CMake Presets as well as some crashes, and contains various other improvements.

Python Mobile App Development: Bringing PySide6 on iOS

Ece.Cinucen@qt.io (Ece Cinüçen) — Thu, 30 Jul 2026 09:26:05 GMT

Python mobile app development reaches iOS in Qt 6.12. PySide6 developers can ship native iOS apps from the same codebase they already use for Android and desktop, with no Swift or Objective-C rewrite and no second codebase to keep in sync.

Security advisory: CVE-2026-15037 - XML injection vulnerability in QDom comment, CDATA and processing-instruction serialization

Tuukka Kettunen — Thu, 23 Jul 2026 12:27:55 GMT

An XML injection (improper output neutralization) vulnerability in the Qt XMLQDom comment, CDATA section, and processing-instruction serialization of the Qt Framework (QtXml module) has been discovered and has been assigned the CVE id CVE-2026-15037.

Security advisory: Out-of-bounds read vulnerability in QTextCodec::codecForName() in Qt

Tuukka Kettunen — Tue, 21 Jul 2026 12:31:54 GMT

An out-of-bounds read (buffer over-read) vulnerability in the QTextCodec::codecForName() function of the Qt 5 Core Compatibility APIs (the Qt5Compat module) has been discovered and has been assigned the CVE id CVE-2026-9499

Qt for MCUs 2.12.2 LTS Released

sumitabh.ghosh@qt.io (Sumitabh Ghosh) — Thu, 09 Jul 2026 03:00:00 GMT

Qt for MCUs 2.12.2 LTS has been released and is available for download. This patch release provides several bug fixes and other improvements while maintaining source compatibility with Qt for MCUs 2.12 (see Qt for MCUs 2.12 LTS released). This release does not add any new functionality however as part of a continuous effort to scale Qt for MCUs to more platforms new Tier-2 board Nuvoton Gerda-4L is now available.

A Cross-Platform Rust UI Framework via Qt’s Bridging Technology

matthias.rauter@qt.io (Matthias Rauter) — Wed, 01 Jul 2026 14:15:22 GMT

Rust has achieved something extraordinary: it genuinely excites people to write software. But when it comes to building a real user interface, the ecosystem is still finding its footing. There are numerous options to pick your Rust UI framework from, including those gaining traction, like Iced and egui. Most of the available UI frameworks, however, are still establishing themselves in production environments and fall short in feature-richness. Qt Bridges, a bridging technology in public beta for Rust, brings something different to the table: over three decades of real-world use, commercial support, and a framework that already runs in automotive dashboards, medical devices, and industrial systems worldwide. Qt Bridge for Rust makes that maturity available to Rust developers, providing access to a UI framework that lets you keep your Rust codebase while using Qt Quick’s feature-rich UI libraries and APIs, hardware acceleration, and genuine cross-platform support.

Qt Bridges: Public Beta for the Rust Bridge Is Out!

matthias.rauter@qt.io (Matthias Rauter) — Wed, 01 Jul 2026 14:15:20 GMT

Qt Bridges is a project we have been developing since 2025 to bring Qt’s UI framework capabilities to other programming languages, without going through the full set of bindings. The focus is on the interaction with backend data objects, seamlessly integrated as QML components in a Qt Quick interface.

Introducing the Coco MCP Server Preview

James Vance — Tue, 30 Jun 2026 12:46:04 GMT

Authors: Otso Virtanen and James Vance

The Context Problem in Test Case Generation

Generating tests is one of the most common practical use cases for AI coding agents. However, without runtime code coverage data, an AI coding agent reasoning about test gaps must statically analyze source files and test files to infer what is likely covered. This is unreliable: the agent cannot distinguish between a function that is called indirectly through several layers and one that is never reached, nor can it detect dead code reliably.

Qt Canvas Painter: Accelerated performance using paths

kaj.gronholm@qtcompany.onmicrosoft.com (Kaj Grönholm) — Wed, 24 Jun 2026 05:54:24 GMT

For those who are not yet familiar with the new Qt Canvas Painter, please check the previous blog posts: Introduction, new features, and performance measurements. This blog post introduces paths and path groups to further improve the performance.

Qt Bridges: C# Bridge 0.3.0 Beta Released!

miguel.costa@qt.io (Miguel Costa) — Tue, 23 Jun 2026 12:16:01 GMT

Qt Bridges aim to bring Qt’s UI framework capabilities to commonly used programming languages, like C#, in a way that is familiar to developers using these languages. After the public Beta release, we've continued working on the C# bridge, adding new features and making improvements based on the feedback that we've received. Today we are announcing the release of a new Beta version 0.3.0, including some of these recent additions.

Learn how to start using Qt as your next C# UI framework, try it out, and send us your feedback.