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CVE-2026-44890: Netty is a network application framework for development of protocol servers and clients

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HIGH 7.5REMOTEUPGRADE

CVE-2026-44890 is a high-severity flaw (CVSS 7.5) affecting netty. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.5% (top 60%)
CISA exploited listNo
WeaknessCWE-400, CWE-770
Published2026-06-11
Last modified2026-09-18
Publisher (CNA): GitHub, Inc. · Vendor: netty

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Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

netty netty UPGRADE
Affected: < 4.1.135 · >= 4.2.0 and < 4.2.15
Fixed in: 4.1.135, 4.2.15
Safe to downgrade to: a release before 4.2.0
1. Check installed version
apt-cache policy netty || rpm -q netty || netty --version
2. UPGRADE to 4.1.135 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade netty
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade netty
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 4.2.0 (Debian / Ubuntu)
apt-cache madison netty sudo apt install netty=<VERSION_BEFORE_4.2.0> sudo apt-mark hold netty
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list netty sudo dnf downgrade netty-<VERSION_BEFORE_4.2.0> sudo dnf versionlock add netty
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44890?

netty: upgrade to 4.1.135, 4.2.15. Exact commands for each OS are on this page.

Is CVE-2026-44890 being exploited?

CVE-2026-44890 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44890 affect?

CVE-2026-44890 affects netty. Severity is high (CVSS 7.5). 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 con

How urgent is CVE-2026-44890?

Priority 41/100. High severity; Remotely exploitable, no login, no user action

Software pages

Redis vulnerabilities

Related CVEs

References

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