Cloudflare experienced a significant traffic outage on December 5, 2025, starting approximately at 8:47 UTC. The incident lasted approximately 25 minutes before resolution. We are sorry for the impact that it caused to our customers and the Internet. The incident was not caused by an attack and was due to configuration changes being applied to attempt to mitigate a recent industry-wide vulnerability impacting React Server Components.
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The original was posted on /r/rust by /u/MakotoE on 2025-12-06 02:06:36+00:00.

I found it interesting that the error causing the outage was already mitigated in their rust version of the old proxy. In the lua version they neglected to do a runtime check when accessing an object, resulting in ‘attempt to index field ‘execute’ (a nil value)’

This is a straightforward error in the code, which had existed undetected for many years. This type of code error is prevented by languages with strong type systems. In our replacement for this code in our new FL2 proxy, which is written in Rust, the error did not occur.