PHP is vulnerable to Information Disclosure. Reading past the allocated buffer is possible when using certain mbstring functions to convert multi-byte encodings.
lists.opensuse.org/opensuse-security-announce/2020-03/msg00023.html
access.redhat.com/documentation/en-us/red_hat_software_collections/3/html/3.6_release_notes/
access.redhat.com/errata/RHSA-2020:5275
access.redhat.com/security/updates/classification/#moderate
bugs.php.net/bug.php?id=79037
lists.debian.org/debian-lts-announce/2020/02/msg00030.html
seclists.org/bugtraq/2020/Feb/27
seclists.org/bugtraq/2020/Feb/31
seclists.org/bugtraq/2021/Jan/3
security.gentoo.org/glsa/202003-57
security.netapp.com/advisory/ntap-20200221-0002/
usn.ubuntu.com/4279-1/
www.debian.org/security/2020/dsa-4626
www.debian.org/security/2020/dsa-4628
www.oracle.com/security-alerts/cpuApr2021.html
www.oracle.com/security-alerts/cpujul2020.html
www.tenable.com/security/tns-2021-14