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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.

PUBLISHED Reserved 2026-04-28 | Published 2026-05-13 | Updated 2026-05-14 | Assigner GitHub_M




MEDIUM: 6.8CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Problem types

CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

Product status

>= 4.2.0.Alpha1, < 4.2.13.Final
affected

< 4.1.133.Final
affected

>= 4.2.0.Alpha1, < 4.2.13.Final
affected

< 4.1.133.Final
affected

References

github.com/.../netty/security/advisories/GHSA-rgrr-p7gp-5xj7 exploit

github.com/.../netty/security/advisories/GHSA-rgrr-p7gp-5xj7

cve.org (CVE-2026-42586)

nvd.nist.gov (CVE-2026-42586)

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