https://wccftech.com/unc0ver-jailbreak-for-ios-14-to-ios-14-3-released-with-support-for-iphone-6s-to-iphone-12/

The jailbreak community has been anxious for a while now, waiting for the next big release and now it has finally arrived. That's right, after teasing the jailbreak last week, the Unc0ver team has finally released a working iOS 14 to iOS 14.3 jailbreak with support for all iPhone models starting from the iPhone 6s to the iPhone 12 series. That's right, you can now finally jailbreak iPhone 12 using the latest Unc0ver jailbreak tool. See more details on the latest release below.

@Pwn20wnd has released Unc0ver 6.0 jailbreak to the public. Take note that this is a complete jailbreak with support for tweak injection via Substitute along with package management using Cydia. As mentioned earlier, the Unc0ver jailbreak tool can be used to jailbreak an iPhone running iOS 14 to iOS 14.3. More importantly, this is the first jailbreak released for iPhone 12 series. So if you have an iPhone 12 model, you can now jailbreak it using the new Unc0ver tool.