Palo Alto Networks Acknowledges SquareX Research on Limitations of SWGs Against Last Mile Reassembly Attacks

SquareX describes "Last Mile Reassembly" attacks that exploit architectural limitations in Secure Web Gateways to smuggle malicious payloads and reassemble them inside browsers—using channels like WebRTC, gRPC, and WebSockets to evade inspection—and demonstrates related data-exfiltration techniques (Data Splicing); Palo Alto Networks has publicly acknowledged these limitations, and SquareX promotes browser-native defenses and ongoing research including multiple disclosed browser zero-days.