Longinus: 2 Boundaries in One Bug, Piercing Chrome’s Renderer and V8 Sandbox with a Single Vulnerability, CVE-2026-6307
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A Chrome sandbox escape vulnerability is highly technical, novel, and strategically important for security and browser engineering.
CVE-2026-6307 is a single V8 vulnerability in Chrome's TurboFan JIT compiler that provides both arbitrary read/write within the V8 heap sandbox and a sandbox escape, enabling full RCE without additional bugs. Discovered in Chrome 106 and present for four years, the bug exploits incorrect deoptimization metadata during JS-to-Wasm inlining, allowing an attacker to corrupt the sandbox base pointer. The writeup details how Turboshaft's value-numbering behavior and Sea of Nodes graph representation enable this dual primitive from one flaw.