Description

Buffer overflow in V8 in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-25T21:17:48.473Z",
  "pubdate": "2026-08-25T21:17:48.473Z",
  "executiveSummary": "A buffer overflow vulnerability exists within the V8 JavaScript engine utilized by Google Chrome.\nThis flaw allows a remote attacker to achieve arbitrary code execution within the confines of the browser sandbox.\nThe vulnerability affects Google Chrome versions prior to 152.0.7977.65.\nThe security impact is classified as Medium by the Chromium project, despite the capability for arbitrary code execution, due to the mitigating influence of the sandbox architecture.\nExploitation requires a remote attacker to entice a user to navigate to a specifically crafted HTML page.\nSuccessful exploitation compromises the integrity of the browser environment, though the sandbox restricts the attacker's ability to escalate privileges to the underlying operating system.\nThe primary risk involves the execution of malicious scripts that could lead to browser-based data theft or further sandbox escape attempts.",
  "technicalDetails": "The vulnerability originates from an improper bounds checking mechanism within the V8 engine, the high-performance JavaScript and WebAssembly engine used by Chromium.\nA buffer overflow condition is triggered when the engine fails to adequately validate the size of data written to a memory buffer during specific operations. This typically involves the mishandling of heap-allocated objects or array structures during just-in-time (JIT) compilation or optimization phases.\nThe attack flow commences when an attacker hosts a maliciously crafted HTML page containing JavaScript designed to trigger the identified overflow. When the victim loads this page, the V8 engine parses the malicious code, causing an out-of-bounds write operation.\nThis write operation allows an attacker to overwrite adjacent memory addresses within the V8 heap. By carefully structuring the payload, an attacker can overwrite critical metadata, such as object pointers or function entry points, to redirect the execution flow of the process.\nAlthough the execution occurs within the Chromium sandbox, the ability to execute arbitrary code provides the attacker with a platform to manipulate the browser process's memory space. This may involve bypassing various V8 security features such as pointer compression or control-flow integrity checks.\nThe vulnerability does not require authentication from the user, as the exploit is triggered passively upon page rendering. The privilege requirements are limited to standard user-level access, as the browser inherits the permissions of the local user account.\nPost-exploitation impact is constrained by the Chromium sandbox architecture, which isolates the renderer process from the host operating system. However, this vulnerability serves as a critical primitive for more complex exploit chains, potentially combined with further vulnerabilities to achieve a full sandbox escape or to exfiltrate sensitive site-specific data through the compromised renderer process."
}