Provide references for CVE-2019-8638.
Where can I find more information about CVE-2019-8638?
References are available at: https://support.apple.com/en-us/HT209599, https://support.apple.com/en-us/HT209602, https://support.apple.com/en-us/HT209603, https://support.apple.com/en-us/HT209604, https://support.apple.com/en-us/HT209605.