In an increasingly open and transparent information environment, negative media coverage of Environmental, Social, and Governance (ESG) issues would detriment focal firms’ legitimacy and performance. However, we have a limited understanding of whether negative media coverage of supply chain partners would spill over to focal firms. Using a panel dataset from Chinese listed firms, we examine the research question at a dyadic (i.e., focal firm and supplier or customer) level. This study reveals that negative media coverage about supply chain partners’ ESG issues can cause a spillover effect, negatively impacting the focal firms’ financial performance. Notably, the extent of this impact is contingent on the reach of the media sources and the severity of the coverage. We also show that focal firms are more impacted by supply chain partners with stronger relationships and greater market power. Our findings underscore the importance of actively managing partners’ ESG issues to avoid potential financial losses within a multi-tier supply chain. This study has fruitful contributions to the literature on supply chain sustainability and the spillover effect in dyadic relationships.