An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27.2 and iPadOS 27.2, macOS Golden Gate 27.2, tvOS 27.2, visionOS 27.2, watchOS 27.2. Processing a maliciously crafted font may lead to unexpected app termination or corrupt process memory.
https://support.apple.com/en-us/149526
https://support.apple.com/en-us/149525
https://support.apple.com/en-us/149524
https://support.apple.com/en-us/149521