Engineering postmortems, with sources

Production Incident Atlas

Follow the timeline of real engineering failures: what broke, how teams detected it, how they recovered, and what they changed afterward. Timeline claims link to their sources.

1 documented incident

Software & infrastructureMajor

Cloudflare’s July 2019 outage: a WAF rule exhausted CPU worldwide

Cloudflare WAF and global network · 6 timeline events

A globally deployed WAF rule contained a regular expression with excessive backtracking, exhausting CPU on Cloudflare’s HTTP/HTTPS serving path.

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Production Incident Atlas

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Cloudflare’s July 2019 outage: a WAF rule exhausted CPU worldwide