CVE-2026-44248

A flaw was found in Netty, an asynchronous event-driven network application framework. A remote attacker can exploit this vulnerability by sending a crafted MQTT 5 header with an oversized Properties section. This causes Netty to repeatedly parse and buffer the large Properties section in memory...

netty: Denial of Service attack on windows app using Netty

A flaw was found in Netty. An unsafe reading of the environment file could potentially cause a denial of service. When loaded on a Windows application, Netty attempts to load a file that does not exist. If an attacker creates a large file, the Netty application crashes...

codec-haproxy: HAProxyMessageDecoder Stack Exhaustion DoS

A flaw was found in codec-haproxy from the Netty project. This flaw allows an attacker to build a malformed crafted message and cause infinite recursion, causing stack exhaustion and leading to a denial of service DoS...

netty: HTTP Request Smuggling due to Transfer-Encoding whitespace mishandling

A flaw was found in Netty, where it mishandles Transfer-Encoding whitespace. This flaw allows HTTP Request Smuggling...

codec-haproxy: HAProxyMessageDecoder Stack Exhaustion DoS

A flaw was found in codec-haproxy from the Netty project. This flaw allows an attacker to build a malformed crafted message and cause infinite recursion, causing stack exhaustion and leading to a denial of service DoS...

netty: Request smuggling via content-length header

A flaw was found in Netty. There is an issue where the content-length header is not validated correctly if the request uses a single Http2HeaderFrame with the endstream set to true. This flaw leads to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1. The...

netty: HttpObjectDecoder.java allows Content-Length header to accompanied by second Content-Length header

A flaw was found in Netty before version 4.1.44, where it accepted multiple Content-Length headers and also accepted both Transfer-Encoding, as well as Content-Length headers where it should reject the message under such circumstances. In circumstances where Netty is used in the context of a...

netty: HTTP request smuggling by mishandled whitespace before the colon in HTTP headers

A flaw was found in Netty, where whitespace before the colon in HTTP headers is mishandled. This flaw allows an attacker to cause HTTP request smuggling...