Provide references for CVE-2019-20838.
Where can I find more information about CVE-2019-20838?
References are available at: https://bugs.gentoo.org/717920, https://www.pcre.org/original/changelog.txt, https://support.apple.com/kb/HT211931, http://seclists.org/fulldisclosure/2020/Dec/32, https://support.apple.com/kb/HT212147, http://seclists.org/fulldisclosure/2021/Feb/14, https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E.