Enhanced Security: Rust helps prevent common memory safety vulnerabilities, including buffer overflows and use-after-free errors.
High Performance: Rust delivers native-code performance without requiring a conventional garbage collector.
Gradual Modernization: Microsoft is introducing Rust into selected Windows components, drivers, cloud services, and cryptographic tools rather than replacing all C and C++ code.
Microsoft is integrating the Rust programming language into Windows to eliminate critical security vulnerabilities without sacrificing system performance. While the tech giant has historically relied on C and C++ for decades, these traditional languages are prone to memory management errors that attackers can exploit. By adopting Rust, Microsoft can automatically catch these flaws during development, maintaining low-level hardware control and high speeds while significantly hardening its software against cyber threats.
Memory safety sits at the heart of the move. Programs use memory to store data, manage objects, and carry out tasks. In C and C++, a slip in memory management can lead to a buffer overflow or a use-after-free error, and attackers can exploit some of these flaws to reach sensitive data or run malicious code.
Past Microsoft analyses put memory safety issues at roughly 70% of its security vulnerabilities. The exact share shifts from one report and period to another, but the problem is clearly serious. Rust applies rules for memory access, ownership, and borrowing that block many of these errors at compile time, so developers can catch certain flaws well before customers see the program.
Microsoft also needs software that runs fast and uses resources efficiently. Windows, Azure cloud services, drivers, and cryptographic tools often require direct control over memory and hardware. Rust compiles to native machine code and does not depend on a conventional garbage collector to manage memory.
That makes it a strong fit for work where speed and safety both count. Rust does not eliminate every kind of bug, but it can reduce memory errors without paying the usual garbage collector fee. For software that serves millions of users and supports critical tasks, that balance carries real weight.
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Microsoft is bringing Rust into selected parts of Windows rather than rewriting the entire operating system. One known example is a Graphics Device Interface region component in Windows 11 version 24H2. Changes like this show how safer code can be added to an older system without a full rewrite.
Work has also gone into Rust-based drivers and firmware for Surface devices. The open-source windows-drivers-rs project aims to make Rust a more practical option for driver developers. Drivers run close to the hardware, so memory errors there can create serious risks, and Rust’s safe features can help lower them.
Adopting Rust at a large company takes more than the language itself. Developers need compilers, debuggers, test systems, security checks, and support for legacy code. Microsoft has been connecting Rust to its existing Windows development tools so teams can use it in real products.
In September 2026, Microsoft raised Rust to Tier-1 status for internal development, putting it alongside C++, C#, and TypeScript as one of the company’s best-supported languages. It also described rustc_codegen_utc, a custom Rust compiler backend that ties Rust compilation to its MSVC code-generation tools. This helps teams work with established Windows build systems and existing native code. According to Microsoft, more than 100 project repositories now use the new compiler infrastructure.
Interest in Rust extends to cloud services, cryptography, and other core software. Azure and Microsoft 365 rely on services that handle huge workloads and guard valuable data. Microsoft’s Oxidizer tooling supports Rust use in Microsoft 365 core services.
Microsoft Research has also looked into rewriting its SymCrypt cryptographic library in Rust. Cryptographic tools protect data, verify identities, and secure communication, so mistakes in this code can have severe consequences. Rust can lower memory-related risks in such libraries, though the logic and design still need careful checking.
Rust Will Not Replace All C and C++
The shift does not mean every Windows component will move to Rust. Large C and C++ codebases hold decades of work, tested features, and ties to other software. Rewriting all of it would demand enormous effort and could introduce new bugs or compatibility problems.
Microsoft engineer Galen Hunt has talked about ambitious research into large-scale code modernization and automated code conversion. Some reports presented this as a plan to eliminate C and C++ across Microsoft by 2030, but no confirmed deadline exists for rewriting all Windows code in Rust. A more realistic path combines new code written in Rust, selective rewrites of risky components, and continued use of C and C++ where they still make sense.
Why this MattersThe move toward Rust affects software security, user privacy, and system reliability. Stopping many memory errors before release can lower security risks and the cost of fixing problems later. Wider use may also nudge other technology companies toward safer coding practices that do not sacrifice speed or performance.
Rust cannot stop every attack. Developers can still introduce logic flaws, access-control errors, or unsafe code. The language also demands new skills, and the boundary between Rust and older C++ code can hold risks the compiler cannot fully check. Even so, its memory safety rules give Microsoft one more way to head off common flaws before release.
The bigger change is in how the company builds software. Instead of leaning only on tests, patches, and security reviews, Microsoft can prevent many memory errors at the code level, and its new tools and internal support make that easier for more teams to adopt. As Rust takes on a larger role in Windows, cloud services, drivers, and cryptography, Microsoft aims to trim avoidable security risks while keeping its software fast and dependable.
1. Why is Microsoft increasing its use of Rust?
Microsoft is adopting Rust to reduce memory-related security vulnerabilities while maintaining the speed and efficiency required for system-level software.
2. How does Rust improve software security?
Rust uses ownership, borrowing, and compile-time checks to prevent many memory safety errors before programs reach users.
3. Will Rust replace C and C++ in Windows?
No. Microsoft is gradually introducing Rust into selected components while continuing to rely on existing C and C++ code where appropriate.
4. Does Rust offer performance comparable to C and C++?
Yes. Rust compiles to native machine code and can deliver comparable performance, making it suitable for operating systems, drivers, and other performance-critical applications.
5. Where is Microsoft using Rust beyond Windows?
Microsoft is exploring or adopting Rust in areas such as Azure services, Microsoft 365 infrastructure, device drivers, firmware, and cryptographic software.