The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder.
github.com/netty/netty/compare/netty-4.1.45.Final...netty-4.1.46.Final
github.com/netty/netty/issues/6168
github.com/netty/netty/pull/9924
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