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Vulnerability · Published Jun 11, 2026 · Assigned by GitHub_M

CVE-2026-44890Netty has Unbounded Direct Memory Consumption in its RedisDecoder

High 7.5

In plain English

A high-severity uncontrolled resource consumption in netty from netty. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.5%top 59.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nettyno fix listedDEBIAN-CVE-2026-44890
Debian:13nettyno fix listedDEBIAN-CVE-2026-44890
Debian:14nettyno fix listedDEBIAN-CVE-2026-44890
Mavenio.netty:netty-codec-redis4.1.135.FinalGHSA-6ghj-frrj-jjj3
Mavenio.netty:netty-codec-redis4.2.15.FinalGHSA-6ghj-frrj-jjj3
Ubuntu:25.10nettyno fix listedUBUNTU-CVE-2026-44890
Ubuntu:26.10nettyno fix listedUBUNTU-CVE-2026-44890

Affected products (as reported)

VendorProductVersions
netty netty >= 4.2.0.Final, < 4.2.15.Final< 4.1.135.Final

Weakness: CWE-400, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References