{"id":"UBUNTU-CVE-2026-116542","details":"Netty netty-tcnative before 2.0.84.Final contains an SNI hostname spoofing vulnerability that allows remote unauthenticated clients to alter hostnames via JNI NewStringUTF decoding. Attackers can send overlong encodings like 0xC0 0x80 in the ClientHello server_name to confuse SNI-based certificate selection, access decisions, and logging.","modified":"2026-10-28T20:15:58.339393360Z","published":"2026-10-26T16:17:00Z","upstream":["CVE-2026-116542"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-116542"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-116542"},{"type":"REPORT","url":"https://github.com/netty/netty-tcnative"},{"type":"REPORT","url":"https://repo1.maven.org/maven2/io/netty/netty-tcnative"},{"type":"REPORT","url":"https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/116xxx/cve-2026-116542.json"},{"type":"REPORT","url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.final/openssl-dynamic/src/main/c/sslcontext.c#l2608"},{"type":"REPORT","url":"https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38"},{"type":"REPORT","url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.final"},{"type":"REPORT","url":"https://github.com/netty/netty-tcnative/security/advisories/ghsa-2784-hxmm-4hgf"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-116542"},{"type":"REPORT","url":"https://security-tracker.debian.org/tracker/cve-2026-116542"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding"}],"affected":[{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.33.Fork6-1","1.1.33.Fork10-2","1.1.33.Fork14-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.33.Fork14-1","binary_name":"libnetty-tcnative-java"},{"binary_name":"libnetty-tcnative-jni","binary_version":"1.1.33.Fork14-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116542.json"}},{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.33.Fork26-1","1.1.33.Fork26-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnetty-tcnative-java","binary_version":"1.1.33.Fork26-1build1"},{"binary_name":"libnetty-tcnative-jni","binary_version":"1.1.33.Fork26-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116542.json"}},{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.20-1","2.0.28-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnetty-tcnative-java","binary_version":"2.0.28-1"},{"binary_name":"libnetty-tcnative-jni","binary_version":"2.0.28-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116542.json"}},{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1","2.0.28-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnetty-tcnative-java","binary_version":"2.0.28-1build1"},{"binary_version":"2.0.28-1build1","binary_name":"libnetty-tcnative-jni"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116542.json"}},{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1build1","2.0.28-1build2","2.0.28-1build3","2.0.28-1build4"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.28-1build4","binary_name":"libnetty-tcnative-java"},{"binary_name":"libnetty-tcnative-jni","binary_version":"2.0.28-1build4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116542.json"}},{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1build5","2.0.28-1build6"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.28-1build6","binary_name":"libnetty-tcnative-java"},{"binary_name":"libnetty-tcnative-jni","binary_version":"2.0.28-1build6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116542.json"}},{"package":{"name":"netty-tcnative","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/netty-tcnative?arch=source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