Cloudflare outage (November 2025)

A global Cloudflare outage on 18 November 2025 that left many websites and services returning errors for several hours. According to Cloudflare's post-mortem, a permissions change to a database system caused a query to return duplicate rows, doubling the size of a feature file used by its Bot Management system. The file exceeded a limit of 200 features in the proxy software, which panicked and failed to serve traffic. Problems began at 11:20 UTC; core traffic was largely flowing again by about 14:30 UTC and all systems were functioning normally by 17:06 UTC. Cloudflare initially suspected a large-scale attack before identifying the cause.

Text from OyList