Apple’s iOS 18.6 update is more than another routine iPhone patch.
Released on July 29, 2025, this version fixes 24 security vulnerabilities — including a critical WebKit zero-day that was already under active attack. That means hackers were exploiting it before Apple pushed the patch.
If you’ve been delaying the update because you’re waiting for iOS 26 or you fear battery issues, you might be putting your device at real risk.
This update isn’t about flashy features — it’s about closing dangerous holes in the system that can leak your data or allow malicious code to run.
In this guide, we’ll break down exactly what’s inside the iOS 18.6 update, which problems it solves, and why you should install it as soon as possible.
iOS 18.6 Release Date and Overview
Apple rolled out iOS 18.6 to all compatible iPhones on July 29, 2025. The release was part of a coordinated set of updates for iPadOS, macOS, and watchOS — all focused heavily on security.
This wasn’t a small maintenance push. Apple’s own security notes list 24 distinct CVE identifiers fixed in the update. Several of these could allow apps to execute arbitrary code, access sensitive system data, or bypass privacy controls.
Supported devices include:
- iPhone 15 series
- iPhone 14 series
- iPhone 13 series
- iPhone 12 series
- iPhone 11 series
- iPhone XS, XR
- iPhone SE (2nd generation and later)
If your iPhone can run iOS 18, you can install iOS 18.6.
Full iOS 18.6 Changelog — What’s New
Apple doesn’t often list every small change in a press release, but the iOS 18.6 changelog covers both major and minor fixes:
- Security: 24 vulnerabilities patched across multiple components — WebKit, Kernel, ImageIO, Find My, Bluetooth, and more.
- Photos app: Fixed a bug preventing some users from sharing Memory Movies.
- VoiceOver: Corrected an issue where VoiceOver could read a passcode aloud in certain conditions — a clear privacy risk.
- Bluetooth and Wi-Fi: Improved stability and pairing reliability.
- Privacy enhancements: Tighter permissions for certain camera and microphone requests, especially for EU regulatory compliance.
- Performance: Faster app launch times for some built-in apps.
The changes may look small on the surface, but several address deep system-level issues.
24 Security Vulnerabilities Fixed in iOS 18.6
This is the main reason to update now.
Apple’s official security update page for iOS 18.6 lists 24 vulnerabilities.
These range from memory corruption bugs to logic errors that could let a malicious app escalate privileges or bypass security restrictions.
A few highlights:
- Kernel flaws that could let an attacker run code with kernel privileges — the most powerful level of access.
- WebKit issues that could allow malicious websites to execute arbitrary code.
- ImageIO vulnerability that could be exploited simply by opening a malicious image file.
- Find My bug that might expose location data to unauthorized apps.
Apple confirmed that one of these WebKit flaws was already exploited in targeted attacks before the update was released.
The WebKit Zero-Day Patch You Can’t Ignore
The star of this update — or the villain, depending on your point of view — is CVE-2025-6558, a WebKit zero-day.
What is WebKit?
It’s the browser engine that powers Safari and any other browser on iOS. Even Chrome and Firefox on iPhone use WebKit under the hood.
What did the bug do?
The flaw allowed malicious web content to execute arbitrary code on your device. That means simply visiting a dangerous webpage could give an attacker control.
Why is it urgent?
Apple says this bug “may have been actively exploited.” That’s Apple-speak for “we have evidence it’s already being used in the wild.”
Bottom line: If you browse the web on your iPhone — and you do — you need the iOS 18.6 WebKit fix right now.
Not-So-Minor Bug Fixes in iOS 18.6
Beyond security, iOS 18.6 cleans up some annoying and potentially risky bugs.
Photos App Bug
Some users couldn’t share Memory Movies through the Photos app. iOS 18.6 fixes this so your curated moments can be shared without glitches.
VoiceOver Passcode Issue
An accessibility flaw allowed VoiceOver to read out a passcode in rare situations. That’s a clear privacy leak — now patched.
Connectivity Stability
Bluetooth and Wi-Fi connections should now drop less often, especially when using AirPods or CarPlay.
These may sound small compared to a zero-day, but they matter for everyday usability and privacy.
Battery Drain in iOS 18.6 — Fact or Fiction?
Every iOS update spawns battery life complaints, and iOS 18.6 is no exception.
Some users have reported faster battery drain since updating. This can happen for several reasons:
- Post-update indexing and background processes temporarily using more power.
- New security features slightly increasing processor activity.
- Apps not yet optimized for the update.
Quick fixes to improve battery life:
- Turn off Background App Refresh for non-essential apps.
- Disable Hey Siri if you rarely use it.
- Lower Haptic Feedback intensity in Settings → Sounds & Haptics.
- Check Battery Usage in Settings to see if one app is draining power abnormally.
In most cases, battery performance returns to normal within a few days as the system settles.
How to Update to iOS 18.6 Safely
Updating is simple, but a little preparation goes a long way.
- Back up your iPhone — via iCloud or iTunes/Finder on your Mac/PC.
- Connect to Wi-Fi — updates are large, and cellular may be slower or cost data.
- Charge your battery — at least 50% or keep it plugged in.
- Go to Settings → General → Software Update.
- Tap Download and Install under iOS 18.6.
Stay on Wi-Fi until the update is complete and your device restarts.
Should You Update Now — or Wait?
For most people, the answer is simple: update now.
The security benefits outweigh any small bugs or temporary battery drain. Delaying a patch for an actively exploited vulnerability is asking for trouble.
The only case for waiting is if:
- You use specialized apps that have not yet been tested with iOS 18.6.
- You’re on an older device and want to monitor initial reports for major slowdowns (so far, none reported).
But even then, the risk of staying on iOS 18.5 or earlier is significant.
Final Thoughts
The iOS 18.6 update is one of the most important mid-cycle releases Apple has pushed in recent years.
It’s not about flashy features — it’s about making sure your iPhone isn’t wide open to attackers exploiting a live zero-day.
Update now, adjust your battery settings if needed, and keep your device safe.
FAQs
What’s the iOS 18.6 release date?
July 29, 2025.
How many security vulnerabilities does iOS 18.6 patch?
24 in total, including one actively exploited WebKit zero-day.
Is iOS 18.6 causing battery drain?
Some users report it, but it’s often temporary. Adjust settings and wait a few days.
What bug does the Photos app fix?
A problem that stopped users from sharing Memory Movies.
How do I install iOS 18.6?
Settings → General → Software Update → Download and Install.
