The growing importance of research software heightens concerns about research software security, which will only intensify if not proactively addressed. Before any specific measures or interventions can be suggested, it is essential to understand the RSE community’s security behaviors, competencies, and values, collectively referred to as their ‘security culture’ [1]. While studying the climate and culture within a group of people is not a new concept or research topic, to our knowledge, no security culture research has taken place within the RSE community. In this study, we aim to characterize the security culture of the RSE community by replicating a prior work performed in the open-source software space [3]. To broaden our sample, we distributed this survey to RSE community members in both the US and Germany. By replicating an existing survey, we can compare the RSE community’s responses with those of the open-source community, which shares some characteristics with RSE [4-5]. In addition to the original survey, we added a series of vignettes to gauge the RSE community’s knowledge and perception of threat modeling, a standard “shift-left” approach to security. By doing so, we gauge RSE interest in participating in security efforts and motivate future security research in the research software domain. Ultimately, we surveyed 104 members of the RSE community, including both those in the US and Germany. To characterize RSE security culture, we ask the following research questions: RQ1: What is the security culture of the RSE community? RQ2: How does the RSE community’s security culture compare with the Open-Source Community’s security culture? RQ3: What is the perception among RSE community members on adopting threat modeling during development? The primary contributions of this study are: 1) A novel characterization of the RSE community’s security culture, 2) an empirical comparison of the security culture of RSEs and OSS developers, and 3) recommendations for internal and external stakeholders to improve RSE security culture. This study is a first step toward tailoring “shift-left” security principles to address the unique challenges that RSEs face.