{"id":"CVE-2026-76816","title":"Netty is an asynchronous, event-driven network application framework","summary":"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, al…","severity":"low","cvss":3.5,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cwe":["CWE-20","CWE-626","CWE-170"],"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform 7","affected":["amq_broker 7","build_of_apache_camel_for_spring_boot 4","fuse 7","jboss_enterprise_application_platform 7","single_sign_on 7"],"published":"2026-08-24","updated":"2026-10-12","sourceUpdated":"2026-10-12T21:10:00.227","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76816","references":[{"url":"https://github.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/commit/9e0519239108a69b7e9bbc5e9182ee139a0d7961","label":"security-advisories@github.com"},{"url":"https://github.com/netty/netty/security/advisories/GHSA-43fm-7cxg-hf3j","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76816.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-76816"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523094"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-76816"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76816"}],"tags":["nvd","csaf","vex","red-hat"],"epss":0.00174,"epssPercentile":0.06822,"ingestedAt":"2026-09-09T21:22:45.549Z","slug":"CVE-2026-76816","body":"## Overview\n\nNetty 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat AMQ Broker 7, Red Hat build of Apache Camel for Spring Boot 4, Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7 · no fix planned: Red Hat Fuse 7, Red Hat JBoss Enterprise Application Platform 7, Red Hat Single Sign-On 7, Red Hat AMQ Broker 7, … · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76816.json)","depth":"sunlit","depthScore":19,"depthScoreParts":{"impact":19.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}