Cloudflare BGP Route Leak Incident on January 22, 2026: Technical Analysis and Response
By
nomaxx117
Hand-rolled, kettle-boiled, baked to perfection. Worth every minute at the bakery.
Summary
On January 22, 2026, an automated routing policy configuration error at Cloudflare's Miami data center caused a 25-minute BGP route leak that unintentionally funneled traffic through their infrastructure. The incident affected both Cloudflare customers and external parties, causing network congestion, elevated packet loss, and higher latency. The article details the technical incident, its impact, and the changes being implemented to prevent similar occurrences.
Key quotes
· 3 pulledOn January 22, 2026, an automated routing policy configuration error caused us to leak some Border Gateway Protocol (BGP) prefixes unintentionally from a router at our data center in Miami, Florida.
While the route leak caused some impact to Cloudflare customers, multiple external parties were also affected because their traffic was accidentally funnelled through our Miami data center location.
The route leak lasted 25 minutes, causing congestion on some of our backbone infrastructure in Miami, elevated loss for some Cloudflare customer traffic, and higher latency for traffic.
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