Apple Releases macOS Big Sur 11.3.1 With Fixes for WebKit Security Issues - MacRumorsOpen MenuShow RoundupsShow Forums menuVisit ForumsOpen Sidebar
Skip to Content

Apple Releases macOS Big Sur 11.3.1 With Fixes for WebKit Security Issues

Alongside iOS 14.5.1 and watchOS 7.4.1, Apple today also released macOS Big Sur 11.3.1, which the company says "provides important security updates".

macOS Big Sur Feature Purple
According to the full security notes for the release, it addresses a memory corruption issue and an integer overflow in WebKit that could both be exploited using maliciously crafted web content. Apple says it aware of a report that these issues may have been actively exploited, so users are advised to upgrade immediately.

Related Forum: macOS Big Sur

Popular Stories

iphone 18 pro blue%402x

iPhone 18 Pro: Dark Cherry, Light Blue, and Dark Gray Chassis Leaked [Update]

Thursday June 4, 2026 5:18 am PDT by
Update: Since publication, new information has come to light suggesting the images have been AI-manipulated and are not in fact iPhone 18 Pro chassis parts. The original article follows. The color options Apple is reportedly planning for the upcoming iPhone 18 Pro and ‌iPhone 18 Pro‌ Max have appeared online today in the form of images of chassis parts of unknown authenticity....
Aston Martin CarPlay Ultra Screen

Apple Says CarPlay Ultra is Coming to These Vehicle Brands

Thursday May 21, 2026 11:53 am PDT by
Last year, Apple launched CarPlay Ultra, the long-awaited next-generation version of its CarPlay software system for vehicles. Nearly a year later, CarPlay Ultra is still limited to Aston Martin's latest luxury vehicles, but that should change fairly soon. In May 2025, Apple said many other vehicle brands planned to offer CarPlay Ultra, including Hyundai, Kia, and Genesis. CarPlay Ultra...
iOS 27 All the New App Features

iOS 27: All the Rumored App Features

Wednesday June 3, 2026 3:48 pm PDT by
Siri is getting a major overhaul in iOS 27, but Apple also has some big updates planned for apps like Camera, Photos, and Wallet. There are multiple new AI features in the works, plus some non-AI upgrades. Camera Apple is moving Visual Intelligence from the Camera Control button to the Camera app in iOS 27, according to Bloomberg. There will be a Siri mode that will be available alongside...

Top Rated Comments

67 months ago
Do these small point updates really need to be gigabytes in size, take 50+ minutes to install (even on my Macs with SSDs), and push the OS build number? It's like installing a whole new version of macOS each time. Seems inefficient and likely to contribute to SSD wear.
Score: 16 Votes (Like | Disagree)
67 months ago
3.30 GB for me on the M1 MacBook Air. Really Apple? 3.3 GB for a Webkit bug?
Score: 12 Votes (Like | Disagree)
67 months ago
Will they ever fix AirPods audio switching? It is still broken
Score: 10 Votes (Like | Disagree)
67 months ago
Apple, shape up! Every recent updates have been followed up by .1 release about a week later. And more often then not, it’s due to something Apple screwed up and not security related.
Score: 8 Votes (Like | Disagree)
67 months ago

3.30 GB for me on the M1 MacBook Air. Really Apple? 3.3 GB for a Webkit bug?
Any changes to the Sealed System Volume appear to constrain the minimum size of a delta update.
Score: 5 Votes (Like | Disagree)
StevieD100 Avatar
67 months ago

Apple, shape up! Every recent updates have been followed up by .1 release about a week later.
The simple answer is not to install the release until a few weeks have elapsed.
Score: 5 Votes (Like | Disagree)