CVE-2025-6191: High Severity Integer Overflow Vulnerability in Google Chrome’s V8 Engine

Overview

The CVE-2025-6191 vulnerability is a serious security defect found in Google Chrome’s V8 engine. This flaw, which is rated high on the Chromium security severity scale, affects all versions of Google Chrome prior to 137.0.7151.119. It’s a critical concern as it allows a remote attacker to potentially perform out of bounds memory access through a specifically crafted HTML page. Given the widespread use of Google Chrome, this vulnerability could potentially impact millions of users worldwide, posing significant risks of system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-6191
Severity: High (CVSS score 8.8)
Attack Vector: Remote
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise and data leakage

Affected Products

Product | Affected Versions

Google Chrome | Versions prior to 137.0.7151.119

How the Exploit Works

The exploit takes advantage of an integer overflow vulnerability in Google Chrome’s V8 JavaScript engine. An attacker can create a malicious HTML page that, when loaded and executed in a vulnerable version of Google Chrome, can trigger an out-of-bounds memory access. This access could potentially allow an attacker to execute arbitrary code or expose sensitive information from the system’s memory.

Conceptual Example Code

The following is a conceptual example, in JavaScript, of how this vulnerability might be exploited:

// Hypothetical malicious JavaScript code exploiting CVE-2025-6191
let buf = new ArrayBuffer(0x100);
let uint32 = new Uint32Array(buf);
// Trigger integer overflow
for (let i = 0; i < 0x100000000; i++) {
uint32[i] = i;
}
// The overflow leads to out-of-bounds access
let oob_access = uint32[0x100000000];

Please note that this is a conceptual example and may not directly work in a real-world scenario. It is provided for educational purposes only to understand the nature of the exploit.

Mitigation Guidance

Users are strongly advised to update their Google Chrome version to 137.0.7151.119 or later, which contains the necessary security patches to address this vulnerability. If immediate update is not possible, the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation, helping to detect and prevent potential exploit attempts.