One Subtle Regex Takes Down Cloudflare from The Downtime Project

The Downtime Project

Tom Kleinpeter and Jamie Turner

One Subtle Regex Takes Down Cloudflare

54 minutes Posted Apr 12, 2021 at 9:27 pm.

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On July 2, 2019, a subtle issue in a regular expression took down Cloudflare (and with it, a large portion of the internet) for 30 minutes.