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Test your applicationsUpgrade RHEL:7 php-soap to version 0:5.4.16-48.el7 or higher.
This issue was patched in RHSA-2020:1112.
Note: Versions mentioned in the description apply only to the upstream php-soap package and not the php-soap package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
An issue was discovered in PHP before 5.6.40, 7.x before 7.1.26, 7.2.x before 7.2.14, and 7.3.x before 7.3.1. xmlrpc_decode() can allow a hostile XMLRPC server to cause PHP to read memory outside of allocated areas in base64_decode_xmlrpc in ext/xmlrpc/libxmlrpc/base64.c.