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: 2026-05-13
Score: 6.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-rgrr-p7gp-5xj7 Netty Redis Codec Encoder has a CRLF Injection Issue
History

Tue, 26 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Mon, 18 May 2026 18:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

Thu, 14 May 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Io.netty
Io.netty netty-codec-redis
Netty
Netty netty
Vendors & Products Io.netty
Io.netty netty-codec-redis
Netty
Netty netty

Wed, 13 May 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title Netty: CRLF Injection in Netty Redis Codec Encoder
Weaknesses CWE-93
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N'}


Subscriptions

Io.netty Netty-codec-redis
Netty Netty
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-14T18:17:23.328Z

Reserved: 2026-04-28T17:26:12.086Z

Link: CVE-2026-42586

cve-icon Vulnrichment

Updated: 2026-05-14T18:17:13.327Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-13T19:17:24.323

Modified: 2026-06-17T10:48:05.893

Link: CVE-2026-42586

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-13T18:20:46Z

Links: CVE-2026-42586 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T14:34:00Z

Weaknesses