What is HTTP request smuggling? HTTP request smuggling is a technique for interfering with the way a web site processes sequences of HTTP requests that are received from one or more …

The most generally effective way to detect HTTP request smuggling vulnerabilities is to send requests that will cause a time delay in the application's responses if a vulnerability is present.

In this section, we'll describe various ways in which HTTP request smuggling vulnerabilities can be exploited, depending on the intended functionality and other behavior of the application.

In this section, we'll build on the concepts you've learned so far and teach you some more advanced HTTP request smuggling techniques. We'll also cover a variety of HTTP/2-based …

Classic desync or request smuggling attacks rely on intentionally malformed requests that ordinary browsers simply won't send. This limits these attacks to websites that use a front …

Aug 7, 2019 · These requests can be adapted to target arbitrary discrepancies in header parsing, and they're used to automatically identify request smuggling vulnerabilities by HTTP Request …

Aug 6, 2025 · View the latest HTTP request smuggling research papers, tools, and techniques, from PortSwigger Research. Includes introductory and advanced content.

The front-end server rejects requests that aren't using the GET or POST method. To solve the lab, smuggle a request to the back-end server, so that the next request processed by the back …

You can resolve all variants of this vulnerability by configuring the front-end server to exclusively use HTTP/2 when communicating with back-end systems. Alternatively, you could ensure all …

Request smuggling vulnerabilities are the result of discrepancies in how chained systems determine where each request starts and ends. This is typically due to inconsistent header …