If you have been putting off that small “Relaunch” button in the corner of Google Chrome, now is the time to click it. Google has pushed three separate security updates to Chrome’s stable channel in the first half of October 2026, and together they close a long list of memory-safety bugs that attackers prize because they can lead to code running on your computer simply because you opened a booby-trapped web page.

The latest release, announced on 15 October, brings Chrome to version 155.0.8059.84/.85 on Windows and Mac and 155.0.8059.84 on Linux. As usual, Google is rolling it out gradually over the following days and weeks, which means many machines will not have it yet unless someone checks.

What Google fixed this month

The October updates came in quick succession:

• 6 October: a large desktop update that Malwarebytes reported contained 247 security fixes, four of them rated Critical, including use-after-free bugs in Chrome’s browser and navigation code that could allow code to run outside Chrome’s sandbox.
• 13 October: an update to version 155.0.8059.79 (Windows and Linux) and 155.0.8059.80 (Mac) fixing 37 vulnerabilities, seven of them Critical. These included a buffer overflow in ANGLE, the layer Chrome uses to translate graphics instructions, and six use-after-free flaws in areas such as PDF handling, networking, SVG images and media playback.
• 15 October: a smaller update with 10 fixes: one Critical use-after-free in Chrome’s prerendering feature, six rated High (including several in the V8 JavaScript engine and the DOM), and three Medium.

Google has not said that any of the flaws fixed in these three October releases are being exploited in the wild. That is good news, but it is not a reason to wait. Once fixes are public, attackers can study the changes and try to build working exploits against people who have not updated. Google itself keeps technical details restricted until most users are protected, precisely because of that risk.

AI is now finding browser bugs

One detail in the 15 October release stands out. Several of the reported vulnerabilities, including a high-severity memory corruption bug in Chrome’s DOM, were credited to a researcher at the AI company Anthropic working with its Claude model. The 13 October release also credited a V8 bug report to the same researcher with help from Claude. Google’s release notes do not describe exactly how the AI was used.

For readers, the practical meaning is simple. Defenders and researchers are using AI tools to find flaws faster, and it is reasonable to expect attackers to try the same. Faster discovery means more frequent patches, and the gap between a fix being published and someone trying to abuse the bug may shrink. Keeping browsers current is becoming more important, not less.

Why browser updates matter for businesses

For most small businesses, the browser is the front door to everything: online banking, email, accounting software, payment dashboards and cloud storage. A single compromised browser can expose saved sessions and data across all of those services.

Chrome updates itself in the background, but there are common reasons it falls behind:

• The browser is left open for days or weeks, so a downloaded update never gets applied until Chrome restarts.
• Staff use older, unmanaged laptops that are rarely switched off.
• Other Chromium-based browsers on the same machine, such as Microsoft Edge, Brave or Opera, follow their own update schedules.
• Android phones with automatic app updates turned off can lag behind.

How to check your Chrome version

1. Open Chrome and click the three-dot menu in the top-right corner.
2. Go to Help, then About Google Chrome.
3. Chrome will check for updates automatically and download any that are available.
4. Click Relaunch to finish installing. Your open tabs will normally come back after the restart.
5. Confirm the version number shows 155.0.8059.84 or later. If it still shows an older build, the rollout may not have reached you yet, so check again in a day or two.

On a Chromebook, connect to the internet, let the device download the update, then select the “Update device” notification and restart. On Android, open the Google Play Store, search for Chrome and tap Update if the option appears.

For IT administrators

Do not rely on users clicking Relaunch. If you manage devices through Google Workspace, Microsoft Intune or a similar tool, use it to report Chrome versions across your fleet and enforce a relaunch deadline. Prioritise machines used for finance, payroll and administrator accounts. Remember to check other Chromium-based browsers too, as each vendor ships these fixes on its own timeline.

What you should do

• Update today: open About Google Chrome on every computer you use and relaunch the browser.
• Restart regularly: close and reopen your browser at least once a week so updates actually install.
• Check your phone: update Chrome on Android and iPhone through the app store.
• Cover every browser: update Edge, Brave, Opera and any other browsers installed on the same machines.
• Reduce exposure: remove browser extensions you no longer use, and avoid clicking links from unexpected messages until you have updated.

A two-minute restart is one of the cheapest security controls available. With three updates in two weeks, make it a habit rather than an afterthought.

Sources

• Google Fixes 10 Chrome Vulnerabilities, Including Memory Corruption Flaw Found With Claude AI – Cyber Security News
• Google Chrome Update Addresses 37 Vulnerabilities, Including 7 Critical Flaws – India News Network
• Update Chrome and ChromeOS to fix critical security issues – Malwarebytes

Featured image: Photo: "PSP Web Browser" by wyzik, CC BY 2.0, via Openverse — source