AWS’s October 2025 outage in the critical US-EAST-1 region, which disrupted services for apps including Snapchat, Signal, and Roblox, stemmed from a race condition in DynamoDB’s automated DNS management system. A latent defect between the DNS Planner and Enactor components left the regional endpoint without valid IP records, triggering cascading failures in EC2, load balancers, and dependent services. AWS postmortems ruled out external attacks or misconfigurations by customers, emphasizing an internal automation flaw instead. Traders tracking cause-based markets have aligned with this verified technical root cause over speculative alternatives. Ongoing partial issues in Middle East regions and a planned October 24, 2026 European Sovereign Cloud isolation test add context on AWS’s geographic and maintenance risks.