Netty-Codec-Http (>= 4.2.0.Alpha1, <= 4.2.12.Final)

Netty's HttpContentDecompressor and DelegatingDecompressorFrameListener are vulnerable to a decompression bomb denial-of-service attack because the maxAllocation parameter is not enforced when Content-Encoding is set to br (Brotli), zstd, or snappy, allowing attackers to bypass decompression limits and cause unbounded memory allocation.

The Netty HttpClientCodec is vulnerable to response desynchronization when configured with HTTP/1.1 pipelining, HEAD requests, and the server sends 1xx responses, leading to a response body from one request being parsed as another and potentially unsafe socket reuse.