On the rising interest in the sustainability and stability of commercial banks in ASEAN, we set out to examine the impacts of Environmental, Social, and Governance (ESG) activities on bank stability in this region. We build models based on signal theory, stakeholder theory, and overinvestment theory. Upon data collected from banks in the ASEAN from 2015 to 2022, we perform various econometric analyses, including system GMM (Generalized Method of Moments), to demonstrate that attending to ESG imposes an inverse effect on bank stability. It can be seen that the implementation of ESG in banks in ASEAN countries is at the expense of current sustainability. However, in the future, this relationship may be different. The findings support several implications for research and practice in the ASEAN banking environment.