I think that the fix is possible to be beackported to rhel-7.9 because in the openscap-1.2.17 the problematic block of code is the same. However, the associated upstream test case will need to be changed from CTest to automake build system.
This issue happens in a downstream test scenario testing oscap-chroot which is an artificial test scenario. We are currently not aware of any impact of this problem on supported use cases on RHEL 7.
We currently don't plan to fix this bug. The reason is that it appears during a test scenario but it doesn't have impact on a supported uses case. If the bug will start impacting a real-world use-case or will have an impact on a customer, please reopen it with a detailed comment.