Memory corruption vulnerability in Rakuraku Hagaki (Rakuraku Hagaki 2018, Rakuraku Hagaki 2017, Rakuraku Hagaki 2016) and Rakuraku Hagaki Select for Ichitaro (Ichitaro 2017, Ichitaro 2016, Ichitaro 2015, Ichitaro Pro3, Ichitaro Pro2, Ichitaro Pro, Ichitaro 2011, Ichitaro Government 8, Ichitaro Government 7, Ichitaro Government 6 and Ichitaro 2017 Trial version) allows attackers to execute arbitrary code with privileges of the application via specially crafted file.