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CVE-2026-42586— Netty: CRLF Injection in Netty Redis Codec Encoder

CVSS 6.8 · Medium EPSS 0.02% · P5

Affected Version Matrix 4

VendorProductVersion RangeStatus
io.nettynetty-codec-redis>= 4.2.0.Alpha1, < 4.2.13.Finalaffected
< 4.1.133.Finalaffected
nettynetty>= 4.2.0.Alpha1, < 4.2.13.Finalaffected
< 4.1.133.Finalaffected
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I. Basic Information for CVE-2026-42586

Vulnerability Information
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Vulnerability Title
Netty: CRLF Injection in Netty Redis Codec Encoder
Source: NVD (National Vulnerability Database)
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, the Netty Redis codec encoder (RedisEncoder) writes user-controlled string content directly to the network output buffer without validating or sanitizing CRLF (\r\n) characters. Since the Redis Serialization Protocol (RESP) uses CRLF as the command/response delimiter, an attacker who can control the content of a Redis message can inject arbitrary Redis commands or forge fake responses. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Netty 注入漏洞
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之前版本存在注入漏洞，该漏洞源于Redis编码器未验证或清理CRLF字符，可能导致注入任意Redis命令或伪造响应。
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

VendorProductAffected VersionsCPESubscribe
nettynetty >= 4.2.0.Alpha1, < 4.2.13.Final -
io.nettynetty-codec-redis >= 4.2.0.Alpha1, < 4.2.13.Final -

II. Public POCs for CVE-2026-42586

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III. Intelligence Information for CVE-2026-42586

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Same Patch Batch · netty · 2026-05-13 · 12 CVEs total

CVE-2026-425877.5 HIGHNetty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy e
CVE-2026-425827.5 HIGHNetty: HTTP/3 QPACK literal unbounded allocation
CVE-2026-425797.5 HIGHNetty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)
CVE-2026-425837.5 HIGHNetty: Lz4FrameDecoder resource exhaustion
CVE-2026-425777.5 HIGHNetty: epoll transport denial of service via RST on half-closed TCP connection
CVE-2026-425847.3 HIGHNetty: HttpClientCodec response desynchronization
CVE-2026-425806.5 MEDIUMNetty: HTTP Request Smuggling due to incorrect chunk size parsing
CVE-2026-425856.5 MEDIUMNetty: HTTP Request Smuggling due to malformed Transfer-Encoding
CVE-2026-425815.8 MEDIUMNetty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
CVE-2026-442485.3 MEDIUMNetty: Resource exhaustion in MqttDecoder
CVE-2026-42578Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-93

V. Comments for CVE-2026-42586

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