CVE-2026-42583— Netty: Lz4FrameDecoder resource exhaustion
Quick assessment
Affected
netty netty
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.2.13.Final和4.1.133.Final之前版本存在资源管理错误漏洞，该漏洞源于Lz4FrameDecoder在LZ4运行前分配大小为decompressedLength的ByteBuf，可能导致内存分配问题。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| io.netty | netty-codec | < 4.1.133.Final |
affected |
| io.netty | netty-codec-compression | < 4.2.13.Final |
affected |
| netty | netty | >= 4.2.0.Alpha1, < 4.2.13.Final |
affected |
< 4.1.133.Final |
affected |
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I. Basic Information for CVE-2026-42583
Vulnerability Information
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Vulnerability Title
Netty: Lz4FrameDecoder resource exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.2.13.Final和4.1.133.Final之前版本存在资源管理错误漏洞，该漏洞源于Lz4FrameDecoder在LZ4运行前分配大小为decompressedLength的ByteBuf，可能导致内存分配问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| netty | netty | >= 4.2.0.Alpha1, < 4.2.13.Final | - |
|
| io.netty | netty-codec | < 4.1.133.Final | - |
|
| io.netty | netty-codec-compression | < 4.2.13.Final | - |
|
II. Public POCs for CVE-2026-42583
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-42583 (1)
Same Patch Batch · netty · 2026-05-13 · 12 CVEs total
| CVE-2026-42587 | 7.5 HIGH | Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy e |
| CVE-2026-42582 | 7.5 HIGH | Netty: HTTP/3 QPACK literal unbounded allocation |
| CVE-2026-42579 | 7.5 HIGH | Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder) |
| CVE-2026-42577 | 7.5 HIGH | Netty: epoll transport denial of service via RST on half-closed TCP connection |
| CVE-2026-42584 | 7.3 HIGH | Netty: HttpClientCodec response desynchronization |
| CVE-2026-42586 | 6.8 MEDIUM | Netty: CRLF Injection in Netty Redis Codec Encoder |
| CVE-2026-42580 | 6.5 MEDIUM | Netty: HTTP Request Smuggling due to incorrect chunk size parsing |
| CVE-2026-42585 | 6.5 MEDIUM | Netty: HTTP Request Smuggling due to malformed Transfer-Encoding |
| CVE-2026-42581 | 5.8 MEDIUM | Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization |
| CVE-2026-44248 | 5.3 MEDIUM | Netty: Resource exhaustion in MqttDecoder |
| CVE-2026-42578 | 2.9 LOW | Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation |
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V. Comments for CVE-2026-42583
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