---
id: 6752
title: "Check Your Motor Oil Before Turbocharging: CVE-2026-7899, When V8's Optimization Engine Builds Up Carbon"
cve: CVE-2026-7899
cvss: 8.8
vendor: "Google"
product: "Chrome V8 JavaScript/WebAssembly engine"
source_domain: nebusec.ai
source_url: "https://nebusec.ai/research/v8-turboshaft-wasm-phiop-cve-2026-7899/"
published_at: "2026-08-27T00:00:00Z"
tags: ["ai-security", "bug-bounty", "rce", "browser-security", "exploit", "vulnerability", "cve", "javascript-security", "security-research", "v8", "chrome", "webassembly", "cve-2026-7899", "turboshaft"]
phying_url: "https://phying.com/item/6752"
lang: en
---

# Check Your Motor Oil Before Turbocharging: CVE-2026-7899, When V8's Optimization Engine Builds Up Carbon

## Summary

NebuSec details CVE-2026-7899: a Turboshaft Wasm load-elimination flaw where a stale replacement corrupts array lengths into fakeobj, yielding Chrome renderer RCE — a $55,000 Chrome VRP win.

## Why it matters

This research reveals deep compiler-level optimization pitfalls in modern JIT/WASM engines that lead to renderer sandbox escapes.

## Intelligence Metadata

- **Sources:** nebusec.ai
- **CVE:** CVE-2026-7899
- **CVSS:** 8.8
- **Vendor:** Google
- **Product:** Chrome V8 JavaScript/WebAssembly engine
- **Published:** 2026-08-27T00:00:00Z
- **Original:** https://nebusec.ai/research/v8-turboshaft-wasm-phiop-cve-2026-7899/
- **Phying News:** https://phying.com/item/6752