AWS Replaces Fat-Tree Data Center Networks with Random Graph Theory, Cutting Routers by 69%

Steef-Jan Wiggers — Thu, 04 Jun 2026 08:25:00 GMT

AWS disclosed that Resilient Network Graphs, a flat network architecture based on quasi-random graph theory, is now the default for most new data center builds. The design replaces fat-tree hierarchies with direct ToR-to-ToR mesh connections using passive optical ShuffleBoxes, cutting routers by 69%, boosting throughput by 33%, and reducing network power consumption by 40%.

By Steef-Jan Wiggers

A Trailing Slash Bypassed AWS API Gateway Authorization

Steef-Jan Wiggers — Mon, 01 Jun 2026 09:55:00 GMT

A security researcher found that adding a trailing slash to AWS HTTP API paths bypassed Lambda authorizer authentication entirely, enabling unauthenticated wire transfers at a fintech. The root cause is a path normalization mismatch between HTTP API's greedy route matching and its authorization layer. The same vulnerability class appeared in gRPC-Go via CVE-2026-33186.

By Steef-Jan Wiggers

InfoQ - AWS

AWS Replaces Fat-Tree Data Center Networks with Random Graph Theory, Cutting Routers by 69%

A Trailing Slash Bypassed AWS API Gateway Authorization