Security

Let’s start with security. It’s at the forefront of many minds these days, with supply chain issues, cryptojacking and data breaches being common news stories. WebAssembly brings some big guns to the security fight in a number of ways, starting with its security sandbox.

When WASM is executed, the code is not given access to anything, including the network, file system or anything else out of the box. This is known as a deny-by-default security model. For the code running inside the WASM sandbox to interact with the outside world, it must be explicitly granted access to host functions.