Cloudflare experienced another major outage that lasted 25 minutes, affecting 28% of its HTTP traffic. The outage stemmed from a global configuration change intended to fix a React vulnerability, which led to HTTP 500 errors across its network. This incident follows a similar outage just weeks prior, raising concerns about Cloudflare's reliability.

This article analyzes the November 2025 outage that took down major websites, including Cloudflare, due to a configuration error. It explains how a small change in a configuration file led to a cascading failure across multiple services and provides strategies to prevent similar incidents in the future.