{
  "id": 371055,
  "title": "Mitigating HTTP Request Smuggling",
  "url": "https://urgent.news/2026/08/09/mitigating-http-request-smuggling",
  "topic": "world",
  "section": "World",
  "published": "2026-08-09T11:17:04.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/aniket28dot/mitigating-http-request-smuggling-be6"
  },
  "original_language": "en",
  "account": "HTTP Request Smuggling exploits inconsistencies between how front-end and back-end servers parse HTTP requests, allowing attackers to smuggle a request through unnoticed. This occurs when malformed or abnormal HTTP requests are interpreted differently by devices in the data flow between a user and a web server.\n\nThe problem arises when a request contains both Content-Length and Transfer-Encoding headers, causing different servers to prioritize their parsing differently. If a front-end server uses Content-Length and a back-end server uses Transfer-Encoding, the back-end might stop reading early, treating the remaining bytes as the start of a new request—often crafted by the attacker.\n\nFor example, a request with Content-Length: 13 Transfer-Encoding: chunked 0\\r\\n \\r\\n SMUGGLED could be interpreted as two separate requests—one by the front-end and another by the back-end—resulting in the attacker-controlled bytes being executed.\n\nMitigations include upgrading to HTTP/2, rejecting ambiguous requests at the edge, and using consistent parsing configurations. Rejecting both headers immediately prevents smuggling by ensuring a single parsing method. Testing with tools like Burp Suite's HTTP Request Smuggler extension can validate protection measures.",
  "summary": "The Problem When malformed or abnormal HTTP requests are interpreted by one or more entities in the data flow between the user and the web server, such as a proxy or firewall, they can be interpreted inconsistently, allowing the attacker to \"smuggle\" a request to one device without the other device being aware of it. HTTP Request Smuggling HTTP Request Smuggling exploits discrepancies in how…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}