Description

Type confusion in V8 in Google Chrome prior to 152.0.7977.65 allowed a remote attacker leveraging social engineering to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Low)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-25T21:17:51.627Z",
  "pubdate": "2026-08-25T21:17:51.627Z",
  "executiveSummary": "A type confusion vulnerability exists within the V8 JavaScript engine of Google Chrome, identified in versions prior to 152.0.7977.65.\nThe flaw allows a remote attacker to achieve arbitrary code execution within the browser's sandbox environment.\nExploitation requires successful social engineering to entice a user into navigating to a malicious, specially crafted HTML page.\nWhile the Chromium security severity is categorized as Low, the impact of arbitrary code execution within the renderer process presents a significant security risk for data confidentiality and system integrity.\nThis vulnerability highlights a flaw in the memory safety and object type handling mechanisms of the V8 engine, potentially allowing for out-of-bounds access or memory corruption scenarios.\nAttackers leverage this confusion to manipulate the internal state of the JavaScript engine, bypassing standard security controls to execute unauthorized code.",
  "technicalDetails": "The vulnerability originates from a type confusion error in the V8 engine, a critical component of the Chromium browser architecture responsible for JIT (Just-In-Time) compilation and the execution of JavaScript code.\nType confusion occurs when the engine erroneously assigns or assumes an incorrect data type for a memory object, leading to a mismatch between the expected structure and the actual data stored at that memory location.\nIn the context of V8, this typically involves the optimization process where the JIT compiler makes assumptions about object shapes or hidden classes. If these assumptions are invalidated or improperly validated, the engine may perform operations on an object as if it were a different type, such as treating a pointer as an integer or vice-versa.\nThe exploitation flow begins with the delivery of a crafted HTML page containing malicious JavaScript designed to trigger the specific state that leads to the type confusion. This usually involves manipulating specific V8 internal structures such as ArrayBuffers or TypedArrays to create an overlapping memory region.\nBy achieving this primitive, an attacker can gain the ability to perform an out-of-bounds read or write operation within the renderer process memory space. This memory corruption can then be leveraged to overwrite function pointers or object vtables.\nOnce the attacker successfully redirects control flow by overwriting these structures, they can execute arbitrary machine code payloads contained within the context of the renderer process.\nBecause this execution occurs within the sandbox, the attacker's immediate access is restricted by the OS-level isolation provided by the Chromium sandbox architecture. However, gaining control of the renderer process is often the primary stage in a multi-step exploit chain that seeks to escalate privileges or escape the sandbox by targeting secondary vulnerabilities in the browser process or the underlying operating system.\nThe vulnerability does not require authentication or specific privilege levels on the victim's host, relying instead on the victim's interaction with the malicious content, which necessitates social engineering tactics to ensure the victim navigates to the attacker-controlled page."
}