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Microsoft Announces 'Hyperlight Wasm': Speedy VM-Based Security at Scale with a WebAssembly Runtime
Cloud providers like the security of running things in virtual machines "at scale" — even though VMs "are not known for having fast cold starts or a small footprint..." noted Microsoft's Open Source blog last November. So Microsoft's Azure Core Upstream team built an open source Rust library called Hyperlight "to execute functions as fast as possible while isolating those functions within a VM." But that was just the beginning... Then, we showed how to run Rust functions really, really fast, followed by using C to [securely] run Javascript. In February 2025, the Cloud Native Computing Foundation (CNCF) voted to onboard Hyperlight into their Sandbox program [for early-stage projects]. [This week] we're announcing the release of Hyperlight Wasm: a Hyperlight virtual machine "micro-guest" that can run wasm component workloads written in many programming languages... Traditional virtual machines do a lot of work to be able to run programs. Not only do they have to load an entire operating system, they also boot up the virtual devices that the operating system depends on. Hyperlight is fast because it doesn't do that work; all it exposes to its VM guests is a linear slice of memory and a CPU. No virtual devices. No operating system. But this speed comes at the cost of compatibility. Chances are that your current production application expects a Linux operating system running on the x86-64 architecture (hardware), not a bare linear slice of memory... [B]uilding Hyperlight with a WebAssembly runtime — wasmtime — enables any programming language to execute in a protected Hyperlight micro-VM without any prior knowledge of Hyperlight at all. As far as program authors are concerned, they're just compiling for the wasm32-wasip2 target... Executing workloads in the Hyperlight Wasm guest isn't just possible for compiled languages like C, Go, and Rust, but also for interpreted languages like Python, JavaScript, and C#. The trick here, much like with containers, is to also include a language runtime as part of the image... Programming languages, runtimes, application platforms, and cloud providers are all starting to offer rich experiences for WebAssembly out of the box. If we do things right, you will never need to think about whether your application is running inside of a Hyperlight Micro-VM in Azure. You may never know your workload is executing in a Hyperlight Micro VM. And that's a good thing. While a traditional virtual-device-based VM takes about 125 milliseconds to load, "When the Hyperlight VMM creates a new VM, all it needs do to is create a new slice of memory and load the VM guest, which in turn loads the wasm workload. This takes about 1-2 milliseconds today, and work is happening to bring that number to be less than 1 millisecond in the future." And there's also double security due to Wasmtime's software-defined runtime sandbox within Hyperlight's larger VM... Read more of this story at Slashdot.
Cloud providers like the security of running things in virtual machines "at scale" — even though VMs "are not known for having fast cold starts or a small footprint..." noted Microsoft's Open Source blog last November. So Microsoft's Azure Core Upstream team built an open source Rust library called Hyperlight "to execute functions as fast as possible while isolating those functions within a VM."
But that was just the beginning...
Then, we showed how to run Rust functions really, really fast, followed by using C to [securely] run Javascript. In February 2025, the Cloud Native Computing Foundation (CNCF) voted to onboard Hyperlight into their Sandbox program [for early-stage projects].
[This week] we're announcing the release of Hyperlight Wasm: a Hyperlight virtual machine "micro-guest" that can run wasm component workloads written in many programming languages...
Traditional virtual machines do a lot of work to be able to run programs. Not only do they have to load an entire operating system, they also boot up the virtual devices that the operating system depends on. Hyperlight is fast because it doesn't do that work; all it exposes to its VM guests is a linear slice of memory and a CPU. No virtual devices. No operating system. But this speed comes at the cost of compatibility. Chances are that your current production application expects a Linux operating system running on the x86-64 architecture (hardware), not a bare linear slice of memory...
[B]uilding Hyperlight with a WebAssembly runtime — wasmtime — enables any programming language to execute in a protected Hyperlight micro-VM without any prior knowledge of Hyperlight at all. As far as program authors are concerned, they're just compiling for the wasm32-wasip2 target... Executing workloads in the Hyperlight Wasm guest isn't just possible for compiled languages like C, Go, and Rust, but also for interpreted languages like Python, JavaScript, and C#. The trick here, much like with containers, is to also include a language runtime as part of the image... Programming languages, runtimes, application platforms, and cloud providers are all starting to offer rich experiences for WebAssembly out of the box. If we do things right, you will never need to think about whether your application is running inside of a Hyperlight Micro-VM in Azure. You may never know your workload is executing in a Hyperlight Micro VM. And that's a good thing.
While a traditional virtual-device-based VM takes about 125 milliseconds to load, "When the Hyperlight VMM creates a new VM, all it needs do to is create a new slice of memory and load the VM guest, which in turn loads the wasm workload. This takes about 1-2 milliseconds today, and work is happening to bring that number to be less than 1 millisecond in the future."
And there's also double security due to Wasmtime's software-defined runtime sandbox within Hyperlight's larger VM...
Read more of this story at Slashdot.
