Attack Chain

1. The attacker crafts a malicious HTML page containing JavaScript code designed to trigger the type confusion vulnerability in the V8 engine.
2. The victim visits the malicious HTML page, either by directly navigating to it or by being redirected through a phishing attack or drive-by download.
3. The victim’s Chrome browser attempts to render the malicious HTML and execute the embedded JavaScript code.
4. The crafted JavaScript code exploits the type confusion vulnerability in the V8 engine, leading to an incorrect type assignment.
5. The type confusion results in an out-of-bounds memory access, allowing the attacker to read or write to arbitrary memory locations.
6. The attacker leverages the ability to read and write to arbitrary memory locations to inject and execute malicious code within the Chrome process.
7. The attacker gains control of the Chrome process and can perform actions such as stealing cookies, injecting keyloggers, or accessing sensitive information.
8. The attacker may pivot from the compromised browser to other systems on the network, depending on the environment and attacker objectives.

Impact

Successful exploitation of CVE-2026-6363 can lead to arbitrary code execution within the context of the Chrome browser. This could allow an attacker to steal sensitive information such as cookies, credentials, and browsing history. It can also lead to further compromise of the affected system and potentially other systems on the network. While the Chromium security severity is rated as Medium, the impact of successful exploitation can be significant.

Recommendation

• Upgrade Google Chrome to version 147.0.7727.101 or later to patch CVE-2026-6363.
• Deploy the Sigma rule Detect Suspicious Chrome Process Memory Access to detect potential exploitation attempts based on process memory access patterns.
• Monitor web server logs for requests to unusual or suspicious HTML pages that could be used to deliver the exploit.