SMRTR TechNov 19, 2025Ars Technica

Massive Cloudflare outage was triggered by file that suddenly doubled in size

SMRTR summary

A corrupted machine learning configuration file that suddenly expanded beyond 200 features triggered Cloudflare's worst outage since 2019, causing widespread internet disruptions. The file was automatically regenerated every five minutes by a database system undergoing updates, creating unpredictable cycles where the network would fail and recover. Cloudflare resolved the crisis by manually inserting a working file and restarting their systems, while implementing new safeguards.

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