Uninitialized scalar field

The field will contain an arbitrary value left over from earlier computations. A scalar field is not initialized by the constructor
/src/mongo/db/modules/enterprise/src/sasl/sasl_aws_server_conversation.h:41: UNINIT_CTOR 115634 Class member declaration for "_cbFlag".
/src/mongo/db/modules/enterprise/src/sasl/sasl_aws_server_conversation.h:15: UNINIT_CTOR 115634 Non-static class member "_cbFlag" is not initialized in this constructor nor in any functions that it calls.