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

Cloudflare explains outage

When a Cloudflare outage disrupted large numbers of websites and online services yesterday, the company initially thought it was hit by a “hyper-scale” DDoS (distributed denial-of-service) attack.

“I worry this is the big botnet flexing,” Cloudflare co-founder and CEO Matthew Prince wrote in an internal chat room yesterday, while he and others discussed whether Cloudflare was being hit by attacks from the prolific Aisuru botnet. But upon further investigation, Cloudflare staff realized the problem had an internal cause: an important file had unexpectedly doubled in size and propagated across the network.

This caused ......https://arstechnica.com/tech-policy/2025/11/cloudflare-broke-much-of-the-internet-with-a-corrupted-bot-management-file/

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