portswigger.net/research· Aug 19, 2025

Beware the false false-positive: how to distinguish HTTP pipelining from request smuggling

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Sometimes people think they've found HTTP request smuggling, when they're actually just observing HTTP keep-alive or pipelining. This is usually a false positive, but sometimes there's actually a real
🎯 Vulnerability: Web Security Vulnerability
💡 Defense Fix: Implement strict input validation, contextual output encoding, and enforce least-privilege authorization controls.