The V8 JavaScript engine in Google Chrome contains a memory corruption vulnerability that could allow an attacker to gain the ability to execute arbitrary code on the victim’s machine. V8 is the core JavaScript engine that runs in the Chrome browser. As part of Chrome and, it is the most popular JavaScript engine currently available.

In accordance with our coordinated disclosure policy, Cisco Talos worked with Google to ensure that these issues are resolved and that an update is available for affected customers. Google initially fixed this vulnerability in March and merged it in April. However, the company just publicly disclosed it on June 26, per its vulnerability disclosure policies.

Vulnerability details

Google V8 Array.prototype memory corruption vulnerability (TALOS-2019-0791/CVE-2019-5831)

A specific JavaScript code can trigger a memory corruption vulnerability in V8 7.3.492.17 which could potentially be abused for remote code execution. In order to trigger this vulnerability in the context of a browser, such as Google Chrome, the victim would need to visit a malicious web page.

Read the complete vulnerability advisory here for additional information.

Versions tested

Talos tested and confirmed that Google V8, version 7.3.492.17 is affected by these vulnerabilities.


The following SNORTⓇ rules will detect exploitation attempts. Note that additional rules may be released at a future date and current rules are subject to change pending additional vulnerability information. For the most current rule information, please refer to your Firepower Management Center or

Snort Rules: 49442, 49443