Explore WebAssembly's security implications in this 45-minute Black Hat conference talk. Gain a basic understanding of WebAssembly and examine potential security risks for developers. Delve into WebAssembly's low-level semantics, including the Javascript API, linear memory model, and function pointer tables. Learn about linear memory, function tables, Wasm in the browser, Inscript, integer overflows, buffer overflows, existing bugs, and XSS vulnerabilities. Discover preventive measures, the WebAssembly design specification, and the WebAssembly optimizer. Presented by Justin Engler and Tyler Lukasiewicz, this talk offers valuable insights for developers and security professionals working with WebAssembly in browser environments.