Chrome 155 Update Patches 247 Vulnerabilities

What Is Chrome 155?

Google released Chrome version 155 in early October 2026. The update is part of the browser's regular six‑week release cadence and focuses heavily on security. By addressing a large set of vulnerabilities, Chrome 155 aims to keep both personal users and large organisations safe from exploitation.

Scope of the Update

The release notes list 247 distinct vulnerabilities that have been patched. These range from low severity information leaks to high severity remote code execution flaws. The most noteworthy fixes involve four critical use after free defects that could allow an attacker to execute arbitrary code on a victim's machine.

Critical Use After Free Defects Fixed

Use after free bugs occur when software continues to use memory that has already been released. In a browser environment, such bugs can be triggered by malicious web content, leading to a crash or a full compromise of the browsing session.

Chromecast Component

The Chromecast subsystem contained a use after free issue that could be triggered through specially crafted media streams. Exploiting the flaw could let an attacker gain control of the casting device, potentially exposing the home network.

Browser Engine

A flaw in the core rendering engine allowed malicious HTML or JavaScript to free an object and later reference it. Successful exploitation could result in code execution within the browser process, bypassing sandbox protections.

Navigation Module

The navigation code, responsible for handling URL redirects and history management, had a use after free condition that could be triggered by a crafted sequence of redirects. This could enable an attacker to run code in the context of the browsing session.

Track System

Chrome’s media track handling, used for audio and video streams, contained a use after free bug that could be abused when processing malformed media files. The vulnerability could lead to a crash or remote code execution.

Other Vulnerabilities Addressed

Beyond the four critical defects, Chrome 155 resolves a variety of other security issues:

• Twenty‑seven memory safety bugs that could cause denial of service.
• Fifteen cross‑site scripting (XSS) flaws fixed across the JavaScript engine.
• Eight sandbox escape attempts patched in the renderer process.
• Multiple information disclosure weaknesses that could leak browsing history or cache data.

Each fix has been assigned a CVE identifier and is listed in the public vulnerability database. For a full list, see the CVE database.

Impact on Users and Enterprises

For everyday users, the update reduces the risk of drive‑by attacks that exploit browser bugs. Enterprises benefit from a lowered attack surface, especially in environments where Chrome is used for internal web applications.

Security teams should note that the four critical use after free bugs were rated as "high" by the National Vulnerability Database. Attackers who target unpatched systems could gain the same level of access as a local user.

How to Apply the Update

Chrome 155 is distributed through the standard update channel. Users on Windows, macOS, Linux, Android and ChromeOS will receive the patch automatically if automatic updates are enabled.

1. Open Chrome and navigate to the menu (three vertical dots).
2. Select "Help" then "About Google Chrome".
3. Chrome will check for updates and begin downloading version 155.
4. After the download completes, restart the browser to apply the changes.

For managed devices, administrators can push the update via enterprise policies using the Chrome Enterprise policy console. This ensures that all endpoints receive the patch promptly.

Recommendations for Ongoing Security

While Chrome 155 addresses a large number of flaws, maintaining a secure browsing environment requires continuous effort. Consider the following best practices:

• Enable automatic updates on all devices to receive security patches as soon as they are released.
• Adopt a layered security model that includes endpoint protection, network firewalls and web content filtering.
• Regularly audit installed extensions and remove those that are unnecessary or untrusted.
• Monitor public vulnerability feeds such as the US‑CERT National Cyber Awareness System for emerging threats.
• Educate users about phishing techniques and the risks of visiting unknown websites.

By combining timely updates with strong security hygiene, organisations can greatly reduce the likelihood of a successful exploit.

Chrome 155 demonstrates Google’s ongoing commitment to hardening the browser against sophisticated attacks. The patch set not only resolves the immediate threats but also reinforces the underlying architecture, making future vulnerabilities harder to discover.