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Test your applicationsUpgrade RHEL:8 php:7.2/php-mysqlnd to version 0:7.2.24-1.module+el8.2.0+4601+7c76a223 or higher.
This issue was patched in RHSA-2020:1624.
Note: Versions mentioned in the description apply only to the upstream php:7.2/php-mysqlnd package and not the php:7.2/php-mysqlnd package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
An issue was discovered in PHP 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.2. dns_get_record misparses a DNS response, which can allow a hostile DNS server to cause PHP to misuse memcpy, leading to read operations going past the buffer allocated for DNS data. This affects php_parserr in ext/standard/dns.c for DNS_CAA and DNS_ANY queries.