Why is this week’s Windows update so big, and should I install it today?

Microsoft’s October 13 Patch Tuesday fixed about 1,411 flaws — its biggest ever — including a Windows Shell flaw already being exploited that CISA wants patched by October 16.

Your laptop picks the busiest moment of your day to say “Restart required” — and this time the update list looks endless. Short answer: Yes, install it today and restart. On October 13, Microsoft released its largest Patch Tuesday yet, fixing about 1,411 flaws — and one flaw was already being exploited before the fix arrived.

That exploited flaw, CVE-2026-96951 in Windows Shell, scores 8.8 and can bypass Mark of the Web — the warning label Windows puts on files downloaded from the internet so Office and SmartScreen treat them with extra suspicion. If that label is bypassed, a bad file can look safer than it is. The US cybersecurity agency CISA added the flaw to its Known Exploited Vulnerabilities catalog and gave federal agencies until October 16 to patch.

Totals reported vary slightly — 1,411 to 1,413 — depending on what each outlet counts. Most fixes were in Windows, with others in Office, developer tools, SharePoint, and SQL Server. Reporting links the surge in part to Microsoft using AI tools to find more bugs faster: more found bugs means more patches, not necessarily a less safe PC after you update.1.

Save your work first. Close anything you cannot afford to lose in a restart.2. Go to Settings, then Windows Update.

Tap Check for updates and let it finish scanning.3. Install what is offered and restart when asked. If you are mid-task, schedule the restart for tonight instead of skipping it.4.

After the restart, check for updates one more time. Big batches often arrive in more than one wave.5. Update Office and Microsoft Store apps too.

Many of this month’s fixes live outside Windows itself.6. Never install a “patch” from an email link or a pop-up. Only use Windows Update itself — that is the one real source.Pro tip: If the progress bar sits still for a while, give it time and keep the laptop plugged in.

Forcing a shutdown in the middle of a big update can cause more trouble than waiting.Ad’s take: A scary-big number, I know — but a patch is a door being closed. The risky move this week is not updating; it is putting the restart off until next week.