PCMag editors select and review products independently. If you buy through affiliate links, we may earn commissions, which help support our testing.

Apple Patches iPhone Bug Involving Malicious Media Files

The zero-day flaw was exploited to attack specific iOS users, Apple warns.

 & Michael Kan Principal Reporter

Our team tests, rates, and reviews more than 1,500 products each year to help you make better buying decisions and get more from technology.

Our Expert
LOOK INSIDE PC LABS HOW WE TEST
65 EXPERTS
43 YEARS
41,500+ REVIEWS
(Photo by Jakub Porzycki/NurPhoto via Getty Images)

Time to update: Apple has discovered hackers exploiting an iOS bug via malicious media files. 

On Wednesday, the company issued patches to fix two previously unknown flaws, warning that attackers have been abusing both of them to hack select iPhone users.  

“Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on iOS,” the company said, an indicator that hackers targeted high-profile victims. 

The first flaw, CVE-2025-31200, can trigger an iPhone to remotely execute rogue computer code if the device processes an audio stream "in a maliciously crafted media file."

Apparently, the hackers discovered a memory corruption issue in Core Audio, Apple’s digital audio software framework for iOS and macOS. Such corruption issues can cause a program to overwrite or improperly access memory outside the proper bounds, which can lead to unintended behavior. 

The second flaw, CVE-2025-31201, appears to piggyback on the first since it requires the attacker to be able to remotely read and write computer code on iOS. CVE-2025-31201 can let the attacker bypass an Apple security protection called Pointer Authentication Code to fend off memory corruption bugs. 

Although Apple didn’t provide more details, the patches suggest the attackers were chaining both vulnerabilities together to attack select iPhone users. The company also discovered the problem with the help of Google’s Threat Analysis Group, which investigates and counters hacking efforts from foreign governments and spyware providers. 

The fix is arriving through iOS 18.4.1. Apple has issued patches for macOS, tvOS and visionOS. Users can update their iPhones by going to Settings > General > Software Update. The phone will also patch itself if you’ve toggled on automatic updates.

About Our Expert

Michael Kan

Michael Kan

Principal Reporter

My Experience

I've been a journalist for over 15 years. I got my start as a schools and cities reporter in Kansas City and joined PCMag in 2017, where I cover satellite internet services, cybersecurity, PC hardware, and more. I'm currently based in San Francisco, but previously spent over five years in China, covering the country's technology sector.

Since 2020, I've covered the launch and explosive growth of SpaceX's Starlink satellite internet service, writing 600+ stories on availability and feature launches, but also the regulatory battles over the expansion of satellite constellations, fights with rival providers like AST SpaceMobile and Amazon, and the effort to expand into satellite-based mobile service. I've combed through FCC filings for the latest news and driven to remote corners of California to test Starlink's cellular service.

I also cover cyber threats, from ransomware gangs to the emergence of AI-based malware. In 2024 and 2025, the FTC forced Avast to pay consumers $16.5 million for secretly harvesting and selling their personal information to third-party clients, as revealed in my joint investigation with Motherboard.

I also cover the PC graphics card market. Pandemic-era shortages led me to camp out in front of a Best Buy to get an RTX 3000. I'm now following how the AI-driven memory shortage is impacting the entire consumer electronics market. I'm always eager to learn more, so please jump in the comments with feedback and send me tips.

The Best Tech I've Had:

  • My first video game console: a Nintendo Famicom
  • I loved my Sega Saturn despite PlayStation's popularity.
  • The iPod Video I received as a gift in college
  • Xbox 360 FTW
  • The Galaxy Nexus was the first smartphone I was proud to own.
  • The PC desktop I built in 2013, which still works to this day.

Read full bio