CVE-2026-42586
Published:May 13, 2026
Updated:May 18, 2026
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.
Affected Packages
https://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-4.2.0.Final <netty-4.2.13.FinalFix Suggestion:
Update to version netty-4.2.13.Finalhttps://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-3.2.4.Final <netty-4.1.133.FinalFix Suggestion:
Update to version netty-4.1.133.Finalio.netty:netty-codec-redis (JAVA):
Affected version(s) >=4.1.0.Final <4.1.133.FinalFix Suggestion:
Update to version 4.1.133.Finalio.netty:netty-codec-redis (JAVA):
Affected version(s) >=4.2.0.Alpha1 <4.2.13.FinalFix Suggestion:
Update to version 4.2.13.Finalio.netty:netty-codec-redis (JAVA):
Affected version(s) >=4.2.0.Final <4.2.13.FinalFix Suggestion:
Update to version 4.2.13.FinalRelated Resources (6)
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Contact UsCVSS v4
Base Score:
7
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.8
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of CRLF Sequences ('CRLF Injection')
EPSS
Base Score:
0.02