Apple Releases iOS 4.3.4 to Address Latest Jailbreaking Vulnerability

Apple has just released iOS 4.3.4, making good on a promise to patch a vulnerability that has been used for the latest JailbreakMe.com jailbreaking method but which could also allow malicious downloads to infect users' devices. The update is available for the iPhone 4/3GS, third- and fourth-generation iPod touch, and all iPads. A special iOS 4.2.9 update is also available for the CDMA iPhone 4.

ios 4 3 4
The iOS 4.3.4 update comes in as Build 8K2, while the iOS 4.2.9 registers as Build 8E501.

iOS 4.3.4 Software Update

Fixes security vulnerability associated with viewing malicious PDF files.

Apple has also posted security-related documents outlining the three vulnerabilities patched in iOS 4.3.4 and iOS 4.2.9.

Popular Stories

iPhone 17 Pro and Air Feature

Two iPhone 17 Pro and iPhone Air Colors Appear to Scratch More Easily

Friday September 19, 2025 10:02 am PDT by
As reported by Bloomberg today, some of the new iPhone 17 Pro and iPhone Air models on display at Apple Stores today are already scratched and scuffed. French blog Consomac also reported on this topic. The scratches appear to be most prominent on models with darker finishes, including the iPhone 17 Pro and Pro Max in Deep Blue, and the iPhone Air in Space Black. Images Credit: Consoma ...
iOS 26

iOS 26.0.1 Coming Soon, Likely With iPhone Air and iPhone 17 Pro Fix

Thursday September 18, 2025 9:17 am PDT by
Apple is preparing to release iOS 26.0.1, according to a private account on X with a proven track record of sharing information about future iOS versions. The update will have a build number of 23A350, or similar, the account said. It is likely that iOS 26.0.1 will fix a camera-related bug on the new iPhone Air and iPhone 17 Pro models. In his iPhone Air review, CNN Underscored's Henry T. ...
iPhone 17 Pro Colors

iPhone 17 Pro Max Teardown Reveals Qualcomm's Snapdragon X80 Modem for 5G

Friday September 19, 2025 7:39 am PDT by
While the iPhone Air is equipped with Apple's custom C1X modem for cellular connectivity, all of the iPhone 17 models are outfitted with Qualcomm modems still. A teardown video shared on Chinese platform Bilibili today (via Reddit) appears to confirm the iPhone 17 Pro Max is equipped with Qualcomm's Snapdragon X80 modem in particular. The same modem is likely used in the iPhone 17 and iPhone ...
iphone 17 pro max techwoven

Here Are The Best Cases You Can Buy for Your New iPhone 17 and iPhone Air

Friday September 19, 2025 6:46 am PDT by
Apple's new iPhones launch today, and there are plenty of options to choose from when it comes to protecting your new device from drops and scratches. In this article, we're taking a look at some of the best options for iPhone 17, iPhone 17 Pro, and iPhone 17 Air cases, as well as a few charging accessories. Note: MacRumors is an affiliate partner with some of these vendors. When you click a...
iOS 26 on Three iPhones

iOS 26's Liquid Glass Design Draws Criticism From Users

Wednesday September 17, 2025 2:56 pm PDT by
It's been two days since iOS 26 was released, and Apple's new Liquid Glass design is even more divisive than expected. Any major design change can create controversy as people get used to the new look, but the MacRumors forums, Reddit, Apple Support Communities, and social media sites seem to feature more criticism than praise as people discuss the update. Complaints There are a long...
iphone 17 pro inside

iPhone 17 Teardowns Confirm SIM and eSIM-Only Battery Capacities

Friday September 19, 2025 8:39 am PDT by
YouTube channel REWA Technology today shared an iPhone 17 Pro teardown video, offering a closer look inside the model with a SIM card tray. We are still waiting for repair website iFixit to share a more comprehensive teardown of the latest iPhone models, but this video provides a good look in the meantime. The device features various internal design changes, including larger rear camera...

Top Rated Comments

baleensavage Avatar
185 months ago
i thought jailbreaking was legal and your right to do so..... why then does apple keep issuing patches to break the jailbreakers....?

Because this particular method of jailbreaking uses a security loophole that could be used by a malicious website to hack your iPhone. Whether you agree with jailbreaking, it's a good thing that Apple is addressing security concerns like this.
Score: 38 Votes (Like | Disagree)
Aduntu Avatar
185 months ago
i thought jailbreaking was legal and your right to do so..... why then does apple keep issuing patches to break the jailbreakers....?

Jailbreaking is accomplished by exploiting a vulnerability in the device. Apple patches these vulnerabilities like any responsible company should.
Score: 35 Votes (Like | Disagree)
9822737 Avatar
185 months ago
i thought jailbreaking was legal and your right to do so..... why then does apple keep issuing patches to break the jailbreakers....?

What? It's to patch a security hole!
Score: 34 Votes (Like | Disagree)
fabian9 Avatar
185 months ago
i thought jailbreaking was legal and your right to do so..... why then does apple keep issuing patches to break the jailbreakers....?

Because the exploit can also be used to inject non-jailbreak related code.
Score: 22 Votes (Like | Disagree)
GeekLawyer Avatar
185 months ago
i thought jailbreaking was legal and your right to do so..... why then does apple keep issuing patches to break the jailbreakers....?
Apple is patching the legitimate security vulnerability that allowed the jailbreakme break to work. Which could be used by other for malicious purposes.

It's a good precaution for Apple to take. Luckily the jailbreak community has already released their own fix, which means those jailbroken can keep their jailbreak and sense of security.
Score: 21 Votes (Like | Disagree)
GeekLawyer Avatar
185 months ago
It's a trap!

Score: 19 Votes (Like | Disagree)