Feed/CVE-2026-59899
CVE-2026-59899HIGHCVSS 7.5

Netty: [HttpContentEncoder] Unbounded Per-Connection Queue Growth via HTTP/1.1 Pipelining Leads to Denial of Service

Published Jul 22, 2026·Updated Aug 6, 2026

NVD Description

### 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.

Affected Packages (1)

io.netty:netty-codec-httpMAVEN
From 4.2.0.Final
Fixed in = 4.2.15.Final

References

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