{"id":"CVE-2026-116542","aliases":[],"cve":{"records":[{"id":"CVE-2026-116542","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-26T14:30:58.474Z","published":"2026-10-26T14:59:41.528Z","modified":"2026-10-31T01:27:08.152Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-26T14:59:41.528Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-31T01:27:08.152Z"}],"references":[{"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf","tags":["vendor-advisory"],"source":"VulnCheck"},{"url":"https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38","tags":["patch"],"source":"VulnCheck"},{"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L2608","tags":["technical-description"],"source":"VulnCheck"},{"url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final","tags":["release-notes"],"source":"VulnCheck"},{"url":"https://github.com/netty/netty-tcnative","tags":["product"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding","tags":["third-party-advisory"],"source":"VulnCheck"},{"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-176","description":"Improper Handling of Unicode Encoding","source":"VulnCheck"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-31T01:26:42.450861Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"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.","score":6.9,"severity":"medium","published":"2026-10-26T14:59:41.528Z","modified":"2026-10-31T01:27:08.152Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"netty","name":"netty-tcnative","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"2.0.84.Final","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:maven/io.netty/netty-tcnative","packageIdentity":{"ecosystem":"Maven","name":"io.netty:netty-tcnative"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-116542"},{"vendor":"netty","name":"netty-tcnative-boringssl-static","platforms":[],"versions":[{"version":"0","status":"affected","lessThan":"2.0.84.Final","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:maven/io.netty/netty-tcnative-boringssl-static","packageIdentity":{"ecosystem":"Maven","name":"io.netty:netty-tcnative-boringssl-static"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-116542"}],"remediation":[],"references":["https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf","https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38","https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L2608","https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final","https://github.com/netty/netty-tcnative","https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding"],"sources":[{"name":"CVE","id":"CVE-2026-116542","modified":"2026-10-31T01:27:08.152Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116542"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.9},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3}],"sourceAffected":[],"observedAt":"2026-10-31T01:58:03.924Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T13:50:33.774Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-31T02:20:33.443Z","attemptedAt":"2026-10-31T02:20:33.443Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-31T02:20:33.248Z","attemptedAt":"2026-10-31T02:20:33.248Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-31T02:20:34.186Z","attemptedAt":"2026-10-31T02:20:34.186Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-31T02:20:32.346Z","attemptedAt":"2026-10-31T02:20:32.346Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-116542","url":"https://www.first.org/epss/","probability":0.00208,"percentile":0.11025,"date":"2026-10-30","checkedAt":"2026-10-31T02:20:32.346Z"},{"source":"GitHub Advisory Database","id":"GHSA-98m4-7wj9-fxmw","url":"https://github.com/advisories/GHSA-98m4-7wj9-fxmw","modified":"2026-10-26T18:32:58Z","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","checkedAt":"2026-10-31T02:20:33.248Z"},{"source":"NVD","id":"CVE-2026-116542","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116542","modified":"2026-10-31T02:17:32.720","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","checkedAt":"2026-10-31T02:20:33.443Z"},{"source":"NVD","id":"CVE-2026-116542","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116542","modified":"2026-10-31T02:17:32.720","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","checkedAt":"2026-10-31T02:20:33.443Z"},{"source":"ENISA EUVD","id":"EUVD-2026-109912","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-109912","modified":"Oct 26, 2026, 2:59:41 PM","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","checkedAt":"2026-10-31T02:20:34.186Z"}],"aiSummary":{"text":"Netty netty-tcnative before 2.0.84.Final has an SNI hostname spoofing vulnerability, allowing remote unauthenticated clients to alter hostnames via modified UTF-8 decoding. Attackers can send overlong encodings to confuse SNI-based certificate selection and access decisions.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:44:18.082Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-116542"}]}}