In a statement an Apple’s spokesperson made to Forbes, “We’re aware of an issue that affects the encryption strength for backups of devices on iOS 10 when backing up to iTunes on the Mac or PC. We are addressing this issue in an upcoming security update. This does not affect iCloud backups.”
In the meantime, they also advised users to ensure that their Macs and PCs were protected by strong passwords. “We recommend users ensure their Mac or PC are protected with strong passwords and can only be accessed by authorized users. Additional security is also available with FileVault whole disk encryption.”
However we should point out that according to the researchers who discovered the flaw, this hack would only work if the hacker had physical access to your device, meaning that the chances of your iOS backup being compromised is pretty low, unless you’re being targeted specifically, but either way we guess we’ll have to wait for the fix to be released.