The llhttp parser <v14.20.1, <v16.17.1 and <v18.9.1 in the http module in Node.js does not correctly handle multi-line Transfer-Encoding headers. This can lead to HTTP Request Smuggling (HRS). A vulnerability was found in NodeJS due to the llhttp parser in the HTTP module incorrectly handling multi-line Transfer-Encoding headers. This issue can lead to HTTP Request Smuggling (HRS). This flaw allows a remote attacker to send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers, causing web cache poisoning, and conducting XSS attacks.
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