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CVE-2026-76816

3.5 · LOW

Netty is an asynchronous, event-driven network application framework.

Published Aug 24, 2026CWE-20EPSS 0.17%

Overview

CVE-2026-76816 is a low-severity vulnerability. It was published on August 24, 2026 and has a CVSS 3.1 base score of 3.5 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and potentially causing routing, access-control, or identity mismatches in downstream brokers. The vulnerability is exploitable when an application uses Netty's MQTT encoder to construct messages from user-controlled input. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7GitHubgithub.com/netty/netty/commit/9e0519239108a69b7e9bbc5e9182ee139a0d7961GitHubgithub.com/netty/netty/security/advisories/GHSA-43fm-7cxg-hf3j

How CyberStrike helps

Frequently asked questions

What is CVE-2026-76816?

CVE-2026-76816 is a low-severity vulnerability. It was published on August 24, 2026 and has a CVSS 3.1 base score of 3.5 (LOW).

How severe is CVE-2026-76816?

This vulnerability has a CVSS 3.1 base score of 3.5, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-76816?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-76816?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-76816 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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