High · published February 3, 2026
⚡ A crafty attacker can trigger a denial-of-service in Django just by sending a request stuffed with duplicate headers! Think of it like a restaurant where a diner keeps ordering the same dish repeatedly, clogging up the kitchen and leaving other customers waiting. That’s how these duplicate headers can overwhelm your server, slowing everything down or even shutting it down completely. If left unaddressed, this vulnerability could lead to your server getting bogged down, making it unresponsive to legitimate users. Imagine all your app's users unable to access it, just because a sneaky request brought everything to a halt!
Think of it like a restaurant where a diner keeps ordering the same dish repeatedly, clogging up the kitchen and leaving other customers waiting. That’s how these duplicate headers can overwhelm your server, slowing everything down or even shutting it down completely. This issue arises in the `ASGIRequest` handling where multiple duplicate headers can exhaust server resources, creating a denial-of-service scenario. Versions 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28 are affected, along with potentially unsupported versions earlier than 5.0.x.
If left unaddressed, this vulnerability could lead to your server getting bogged down, making it unresponsive to legitimate users. Imagine all your app's users unable to access it, just because a sneaky request brought everything to a halt! To protect your application, upgrade to Django 6.0.2, 5.2.11, or 4.2.28 immediately. Additionally, consider implementing request validation to limit the number of duplicate headers your server will accept. You've got this! Patch it up and keep your users happy and your application running smoothly! 🛡️