Critical Memory Ordering Bug Affects Every Major Browser Engine

This discovery exposes a fundamental flaw in how all major browser engines handle memory synchronization in concurrent scenarios—directly impacting developers using SharedArrayBuffer with multiple Web Workers. The identical bug manifestation across V8 (Chrome/Node.js) and SpiderMonkey (Firefox) suggests the problem lies in the ECMAScript specification itself rather than isolated implementation errors. For WebAssembly developers building high-performance concurrent systems, this missing memory fence could silently corrupt data in production environments.