Key Takeaways
- iOS 26.5.1 fixes a bug that prevented wired charging on iPhone Air and iPhone 17 when the battery was nearly drained
- macOS 26.5.1 addresses unexpected shutdowns on M5 Macs using certain enterprise content filtering extensions
- Both updates arrive one week before Apple unveils iOS 27 and macOS 27 at WWDC on June 8
Apple pushed out iOS 26.5.1 and macOS 26.5.1 on June 1, 2026. Neither update is flashy. Both exist to squash specific, annoying bugs before the company shifts focus to next week's WWDC announcements.
The iOS fix targets a charging problem that Apple says affected "a very small number of users." But for those users, the bug was serious. Wired charging could fail on the iPhone Air and iPhone 17 models when the battery was nearly drained. That's exactly when you need charging to work most.
What the iOS 26.5.1 Update Fixes
According to Apple's changelog, the bug prevented wired charging from working properly when battery levels dropped to critical levels. Users reported plugging in their iPhones only to see no charging response. With a dead battery and no way to charge, the phone becomes a paperweight.
Apple hasn't explained the root cause. The fix applies to iPhone Air and iPhone 17 models specifically, suggesting the issue was tied to hardware or firmware unique to those devices.
macOS 26.5.1 Targets Enterprise M5 Macs
The macOS update fixes a different problem. Macs with M5 chips could shut down unexpectedly when running "certain content filtering network extensions." This primarily affects enterprise environments where IT teams deploy security tools to monitor and filter network traffic.
Research estimates around 3% of enterprise Macs experienced instability related to content filtering. That's a small percentage, but in a company with thousands of Macs, it translates to dozens or hundreds of disrupted machines.
Discussion on Reddit's r/Apple and Hacker News showed IT administrators expressing relief. Many had been troubleshooting the M5 shutdown issue for weeks without a clear fix.
Timing: One Week Before WWDC
These updates land just seven days before Apple unveils iOS 27 and macOS 27 at WWDC on June 8. The new operating systems are expected to ship in September. That makes this week's patches the final maintenance releases for the iOS 26 and macOS 26 cycle.
Apple typically cleans up outstanding bugs before major announcements. It lets the company enter its developer conference without lingering support headaches.
Should You Update?
If you own an iPhone Air or iPhone 17, yes. The charging bug may be rare, but it's severe enough that you don't want to encounter it with a dying battery.
For Mac users, the update matters most if you're running enterprise content filtering tools on an M5 machine. Consumer Mac users likely won't notice any difference.
To update, go to Settings > General > Software Update on iOS, or System Settings > General > Software Update on macOS.
Latest news on Apple's upcoming hardware lineup
Frequently Asked Questions
What does iOS 26.5.1 fix?
iOS 26.5.1 fixes a bug that prevented wired charging on iPhone Air and iPhone 17 models when the battery was nearly drained.
Which devices are affected by the iOS 26.5.1 charging bug?
Apple says the bug affected iPhone Air and iPhone 17 models specifically, though only a very small number of users encountered the issue.
What does macOS 26.5.1 fix?
macOS 26.5.1 fixes unexpected shutdowns on M5 Macs when using certain enterprise content filtering network extensions.
When is iOS 27 coming out?
Apple will unveil iOS 27 at WWDC on June 8, 2026. The public release is expected in September 2026.
How do I install iOS 26.5.1?
Go to Settings > General > Software Update on your iPhone and tap Download and Install.
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Source: GSMArena.com / Vlad
Huma Shazia
Senior AI & Tech Writer
Produced with AI assistance and reviewed by the Logicity editorial team. Learn more in our Editorial Policy.
