CVE-2026-42587
Published: May 13, 2026
Modified: May 13, 2026
CVSS v3.1
7.5
Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb attacks. This limit is correctly enforced for gzip and deflate encodings via ZlibDecoder, but is silently ignored when the content encoding is br (Brotli), zstd, or snappy. An attacker can bypass the configured decompression limit by sending a compressed payload with Content-Encoding: br instead of Content-Encoding: gzip, causing unbounded memory allocation and out-of-memory denial of service. The same vulnerability exists in DelegatingDecompressorFrameListener for HTTP/2 connections. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
| Vendor | Product | Versions |
|---|---|---|
netty | netty | affected >= 4.2.0.Alpha1, < 4.2.13.Finalaffected < 4.1.133.Final |
io.netty | netty-codec-http | affected >= 4.2.0.Alpha1, < 4.2.13.Finalaffected < 4.1.133.Final |
io.netty | netty-codec-http2 | affected >= 4.2.0.Alpha1, < 4.2.13.Finalaffected < 4.1.133.Final |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
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