Nightmare of the Javascript Optimization
Summary
A detailed security write-up about a 0-day use-after-free vulnerability in LadyBird Browser that affects JavaScript and WebAssembly memory handling. The analysis explains how memory structures and the engine's fast-path can lead to a dangling pointer, notes that the issue has been patched, and discusses implications for browser security and memory-safety practices. The post includes a PoC narrative and a full exploit chain, while avoiding disclosing actionable steps.