this post was submitted on 19 Nov 2025
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If you want a technical breakdown that isn't "lol AI bad":
https://blog.cloudflare.com/18-november-2025-outage/
Basically, a permission change cause an automated query to return more data than was planned for. The query resulted in a configuration file with a large amount of duplicate entries which was pushed to production. The size of the file went over the prealloctaed memory limit for a downstream system which died due to an unhandled error state resulting from the large configuration file. This caused a thread panic leading to the 5xx errors.
It seems that Crowdstrike isn't alone this year in the 'A bad config file nearly kills the Internet' club.
There's no such thing as bad data, only shitty code to create it or ingest it, and bad testing that failed to detect the shitty code. The overflow of the magic config-file size threw an exception, and there was no handler for that? Jeez Louise.
And as for unhandled exceptions, you'd think static analysis would have detected that.
Someone should make a programming language like Rust, but that doesn't crash.
/s