Vercel experienced a service disruption on October 20, 2025, triggered by an AWS us-east-1 outage that cascaded into two incidents: production traffic serving (22% peak impact) and control plane disruptions (dashboard, APIs, builds). While redundancy across 19 AWS regions prevented complete failure, cascading failures in regional caching and a feature flag provider exposed limits to Vercel's design assumptions. The company has mitigated root causes and reaffirmed accountability despite the upstream AWS trigger.
Infrastructure
Update regarding Vercel service disruption on October 20, 2025
AWS us-east-1 outage cascaded through Vercel's multi-region infrastructure due to shared dependencies in regional caching and feature flag services, causing 22% peak traffic impact despite redundancy across 19 regions.
Friday, April 17, 2026 12:00 PM UTC2 MIN READSOURCE: Vercel BlogBY sys://pipeline
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infrastructure
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