The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream.

Summary

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.

Timeline

1. Apr 7, 2020, 6:00 PM UTCCVE published
2. Aug 4, 2024, 11:35 AM UTCRecord last updated

Affected versions

• n/a n/a

  Version range not reported

• io.netty:netty-handlerMaven

  From 4.1.0 · fixed in 4.1.46

References 25