GHSA-q4f6-jm68-57ww
Netty: [HttpContentEncoder] Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Leads to Denial of Service
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Maven | io.netty:netty-codec-http | >= 4.2.0.Final, < 4.2.16.Final | 4.2.16.Final |
| Maven | io.netty:netty-codec-http | < 4.1.136.Final | 4.1.136.Final |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
`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.
References
External links from the advisory. They lead to third-party sites.