CRLF injection in Netty - CVE-2026-42586
Published: May 5, 2026
Vulnerability identifier: #VU130213
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-42586
CWE-ID: CWE-93
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Netty
Netty
Software vendor:
Netty project
Netty project
Description
The vulnerability allows a remote attacker to inject Redis commands or poison Redis responses.
The vulnerability exists due to improper neutralization of CRLF sequences in io.netty.handler.codec.redis.RedisEncoder when encoding user-controlled Redis message content. A remote attacker can supply crafted content containing CRLF characters to inject Redis commands or poison Redis responses.
The issue affects inline command mode and simple string or error response types, while RESP array format with binary-safe length-prefixed encoding is not affected.
Remediation
Install security update from vendor's website.