CVE-2026-42586

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.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 4.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7	Exploit Mitigation Vendor Advisory
https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:netty:netty::::::::
	cpe:2.3:a:netty:netty::::::::

History

18 May 2026, 18:02

Type	Values Removed	Values Added
References	~~() https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 -~~	() https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 - Exploit, Mitigation, Vendor Advisory
CPE		cpe:2.3:a:netty:netty::::::::
First Time		Netty netty Netty

14 May 2026, 19:16

Type	Values Removed	Values Added
References	~~() https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 -~~	() https://github.com/netty/netty/security/advisories/GHSA-rgrr-p7gp-5xj7 -

13 May 2026, 19:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-13 19:17

Updated : 2026-05-18 18:02

NVD link : CVE-2026-42586

Mitre link : CVE-2026-42586

CVE.ORG link : CVE-2026-42586

JSON object : View

Products Affected

netty

netty

CWE

CWE-93

Improper Neutralization of CRLF Sequences ('CRLF Injection')

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