Google Chrome emergency update fixes first zero-day of 2023

If you are a Google Chrome user, you should update your browser as soon as possible to protect yourself from a dangerous zero-day vulnerability actively exploited by hackers. In this blog post, I will explain what this vulnerability is, how it can affect you, and what you can do to stay safe.

What is a zero-day vulnerability?

A zero-day vulnerability is a security flaw unknown to the software vendor and the public, but is known and exploited by hackers. This means there is no patch or fix available for the vulnerability, and users are exposed to potential attacks until the vendor releases an update.

Zero-day vulnerabilities are rare and valuable for hackers, as they can bypass the usual security defenses and compromise systems with ease. They are often used in targeted attacks against high-profile or high-value targets, such as government agencies, corporations, or individuals.

What is Chrome’s zero-day vulnerability?

The Chrome zero-day vulnerability (CVE-2023-2033) is a type confusion bug in the V8 JavaScript engine, responsible for executing JavaScript code on web pages. Type confusion occurs when the program fails to check or verify the type of data it is processing, leading to unexpected or incorrect behavior.

In this case, the type confusion bug allows hackers to execute arbitrary code on the victim’s system by crafting a malicious web page that triggers the vulnerability. This means hackers can take over the victim’s browser, steal their data, install malware, or perform other malicious actions.

The vulnerability was discovered by Clement Lecigne of Google’s Threat Analysis Group (TAG), a team of security experts that monitors and defends against state-sponsored attacks. Google said it was aware of exploits for this vulnerability in the wild, but did not provide any details on who was behind them or who was being targeted.

How to update Chrome and protect yourself?

Google has released an emergency update to Chrome that fixes the zero-day vulnerability. The update is available for Windows, Mac, and Linux users, and will be automatically installed on most systems. However, you can also manually check for updates and install them by following these steps:

  1. Open Chrome and click on the menu icon (three dots) in the top-right corner.
  2. Select Help > About Google Chrome.
  3. Chrome will check for updates and will show you the current version number.
  4. If your version is lower than 112.0.5615.121, click on Relaunch to apply the update.
  5. If your version is 112.0.5615.121 or higher, you are already protected.

You should also close and reopen any tabs or windows that you have open before updating Chrome, as they may still be running vulnerable code.


Chrome’s zero-day vulnerability is a serious threat that can compromise your system and data if you use an outdated version of the browser. You should update your browser as soon as possible to fix the vulnerability and prevent potential attacks. You should also be careful about visiting unknown or suspicious websites, and avoid clicking on links or attachments from untrusted sources.

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