The Day the Web Stuttered: Inside the Cloudflare Outage of November 18, 2025
On November 18, 2025, a massive Cloudflare outage disrupted access to some of the world’s most heavily used platforms, including ChatGPT, X, Canva, Spotify, and even public services like transit systems. What began as a technical hiccup quickly evolved into a global slowdown that highlighted the fragile centralization of the modern internet.
According to Cloudflare, the Cloudflare outage was triggered by an unexpectedly large configuration file used in its bot-management system. This file expanded far beyond typical limits and began to destabilize the software responsible for routing and protecting web traffic. As the system struggled, many edge services began returning HTTP 500 errors, causing a widespread breakdown across websites and applications.
This file was designed to help identify and manage “threat traffic” (i.e., bots, suspicious requests), but as it ballooned in size, it triggered failures across critical software systems that handle traffic flow.
Cloudflare noted that it saw a spike in unusual traffic to one of its services around 11:20 UTC, which exacerbated the problem.
As the system crashed, many of its edge services — the very network nodes that route, filter, and protect web traffic — became unstable, causing HTTP 500 “Internal Server Error” messages across a wide array of sites.
