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Technical Details and Exploit Released for Chrome Remote Code Execution Flaw

## Cybersecurity: Google Chrome WebAssembly Vulnerability

LBy Laura MitchellOct 06, 20251 min read

Cybersecurity: Google Chrome WebAssembly Vulnerability

A remote code execution vulnerability affecting Google Chrome's WebAssembly engine has been disclosed, including a fully functional exploit.

The issue originates from a regression in the canonicalization logic for indexed reference types in WebAssembly, identified during TyphoonPWN 2025. This regression allows attackers to craft a hash collision, leading to a bypass of the sandbox via JavaScript Promise Integration (JSPI).

Researchers from SSD Secure Disclosure demonstrated that exploiting a nullability confusion bug, combined with a hash collision technique, provides arbitrary read/write access within the V8 sandbox, enabling native code execution. Seunghyun Lee (0x10n) identified this flaw, securing first place in the Chrome RCE category.

A remote code execution vulnerability affecting Google Chrome's WebAssembly engine has been disclosed, including a fully functional exploit.
Laura Mitchell · Thehackingpost

Hash Collision Generation: A WebAssembly module builder is used to define recursive type groups with nullability variations, resulting in a candidate collision through a birthday attack. Null-to-Non-Null Cast: The collision allows recasting a null reference as non-null, enabling controlled memory access. Caged Read/Write Primitive: Mapping a controlled object to a WasmArray provides arbitrary offset read/write access within the sandbox. JSPI Sandbox Bypass: By triggering nested WebAssembly.promising calls, the exploit gains stack control, allowing execution of arbitrary native commands. Delivery: Serving the exploit over a local HTTP server and launching Chrome with the --no-sandbox flag facilitates code execution.

This issue affects Chrome stable builds from M135 to M137 for null-equivalence checks and M137+ for JSPI bypass. Google has issued a patch to address these vulnerabilities by reverting flawed logic and enhancing stack-state checks.

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Immediate Update: Apply the latest Chrome update from October 2025 or later for the necessary fixes. Avoid --no-sandbox: Do not run Chrome with this flag unless required for debugging purposes. Defense in Depth: Use endpoint protection solutions to monitor unusual WebAssembly activity and process behavior. Audit WebAssembly Usage: Review WebAssembly modules for potential untrusted code execution paths.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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