A flaw was found in php before 7.4.2. A global buffer overflow in mbfl_filt_conv_big5_wchar function may lead to corruption of memory data.
Upstream issue:
http://bugs.php.net/79037
This issue has been addressed in the following products:
Red Hat Software Collections for Red Hat Enterprise Linux 7
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS
Via RHSA-2020:5275 https://access.redhat.com/errata/RHSA-2020:5275