Threat Intelligence

New AI Tool Uncovers Fresh HTTP Request-Smuggling Attacks

Dark Reading · 27 Aug 2026

Key Takeaway Ask your web hosting provider or IT partner whether your infrastructure has been checked for HTTP request-smuggling vulnerabilities, especially if you use multiple proxies or load balancers.

Security researcher James Kettle of PortSwigger has unveiled an open-source tool nicknamed 'HTTP Terminator,' which uses AI to hunt for previously unknown HTTP desynchronization vulnerabilities, more commonly known as request-smuggling attacks. These attacks exploit inconsistencies in how web servers and proxies interpret HTTP requests, potentially allowing attackers to bypass security controls, hijack sessions, or access data intended for other users.

According to Kettle, the tool has already surfaced new variations of these desync techniques that had not previously been documented, suggesting that many web applications and infrastructure setups may still be vulnerable to this class of attack even as older methods have been patched. Request smuggling remains a persistent risk because it often arises from subtle differences between components in a web stack, such as load balancers, proxies, and backend servers, rather than a single obvious flaw.

While HTTP Terminator is primarily aimed at security researchers and penetration testers, its discoveries are a reminder that web infrastructure security is an ongoing process, not a one-time fix. Businesses relying on multiple layers of web infrastructure should ensure their vendors and IT providers are aware of these evolving techniques and are applying relevant patches and configuration reviews.

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Summarised by CISO AI from Dark Reading. We link back to every original so you can read it yourself.