CRLF-Powered Desync Attacks: Beheading HTTP Streams

This research provides technical context that security teams can use for monitoring and validation.

James Kettle's Black Hat USA 2026 research: the HTTP Terminator, an autonomous system that invented novel HTTP desync triggers and exploited banks, security products and government infrastructure.

James Kettle's HTTP Terminator is an autonomous system that invented new HTTP desync attack techniques and used them to compromise banks, security tools, and government infrastructure at scale.

HTTP/1.1 desync attacks can mass-compromise credentials via flaws in Akamai, Cloudflare and Netlify. A parser-discrepancy toolkit earned $200,000 in two weeks — Kettle argues HTTP/1.1 must die.

James Kettle revives HTTP Request Smuggling as HTTP Desync Attacks, splicing requests into victims' connections to poison caches and compromise PayPal's login page, earning over $70k in bounties.

James Kettle follows up on HTTP Desync Attacks with vendor patches from Akamai, F5, HAProxy and Go's CVE-2019-16276, plus fresh desync techniques that expose more systems.