CVE-2026-44890
Received Received - Intake
Denial of Service in Netty Redis Codec

Publication date: 2026-06-11

Last updated on: 2026-06-11

Assigner: GitHub, Inc.

Description
Netty is a network application framework for development of protocol servers and clients. In netty-codec-redis prior to versions 4.1.135.Final and 4.2.15.Final, an attacker can cause DoS by sending crafted Redis payloads across multiple connections without `\r\n`. This exhausts the server's direct memory pool (OutOfDirectMemoryError), preventing legitimate connections from being processed. Versions 4.1.135.Final and 4.2.15.Final patch the issue.
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Meta Information
Published
2026-06-11
Last Modified
2026-06-11
Generated
2026-06-12
AI Q&A
2026-06-12
EPSS Evaluated
N/A
NVD
CVE-2026-44890
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
netty netty_codec_redis to 4.2.15.Final (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Executive Summary

This vulnerability exists in the netty-codec-redis component of the Netty framework prior to versions 4.1.135.Final and 4.2.15.Final. An attacker can exploit it by sending specially crafted Redis payloads across multiple connections that lack the required '\r\n' sequence. This causes the server's direct memory pool to be exhausted, resulting in an OutOfDirectMemoryError.

As a result, the server is unable to process legitimate connections, effectively causing a denial of service (DoS).

Impact Analysis

The primary impact of this vulnerability is a denial of service (DoS) condition. By exhausting the server's direct memory pool, legitimate users are prevented from establishing connections or using the service.

This can lead to service outages, degraded performance, and potential disruption of business operations that rely on the affected Netty-based Redis services.

Mitigation Strategies

To mitigate this vulnerability, upgrade netty-codec-redis to version 4.1.135.Final or 4.2.15.Final or later, as these versions contain the patch that prevents the denial of service caused by crafted Redis payloads.

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