| Package | Affected versions | Patched versions |
|---|---|---|
| io.netty:netty-codec-http | ≥ 4.2.0.Final, < 4.2.16.Final< 4.1.136.Final | 4.2.16.Final4.1.136.Final |
| netty | ≥ 4.2.0, < 4.2.16< 4.1.136 | 4.2.164.1.136 |
HttpContentEncoder (the superclass of the production handler HttpContentCompressor) maintains a per-channel ArrayDeque<CharSequence> named acceptEncodingQueue that accumulates attacker-controlled data without any size limit. The queue is filled on the I/O thread for every inbound HTTP request and drained only when the application later writes a non-1xx response. This creates a resource exhaustion vulnerability when an attacker exploits HTTP/1.1 pipelining to flood the connection with requests faster than the application produces responses.
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