CVE-2026-59899
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Summary
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, 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. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| netty | netty | >= 4.2.0.Final, < 4.2.16.Final | affected |
| netty | netty | < 4.1.136.Final | affected |
Weaknesses
- CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling
References
- https://github.com/netty/netty/security/advisories/GHSA-q4f6-jm68-57ww
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
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