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exploiting-http-request-smuggling

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Detects and exploits HTTP request smuggling caused by Content-Length/Transfer-Encoding parsing discrepancies between front-end and back-end servers, using Burp Suite Repeater (auto Content-Length disabled), the HTTP Request Smuggler extension, and smuggler.py. Use during authorized tests of multi-tier architectures behind a reverse proxy, load balancer, or CDN to find desync flaws and bypass front-end controls.

skills/exploiting-http-request-smuggling/SKILL.md

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Aug 31, 2026
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Apache-2.0

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# Exploiting HTTP Request Smuggling

## When to Use

- During authorized penetration tests when the application sits behind a reverse proxy, load balancer, or CDN
- When testing infrastructure with multiple HTTP processors in the request chain (nginx + Apache, HAProxy + Gunicorn)
- For assessing applications for HTTP desynchronization vulnerabilities
- When other attack vectors are limited and you need to bypass front-end security controls
- During security assessments of multi-tier web architectures

## Prerequisites

- **Authorization**: Written penetration testing agreement explicitly covering request smuggling (high-risk test)
- **Burp Suite Professional**: With HTTP Request Smuggler extension (Turbo Intruder)
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