CVE-2026-116542

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Attackers can send overlong encodings like 0xC0 0x80 in the ClientHello server_name to confuse SNI-based certificate selection, access decisions, and logging."}], "id": "CVE-2026-116542", "lastModified": "2026-10-31T02:17:32.720", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-116542", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-31T01:26:42.450861Z", "version": "2.0.3"}}]}, "published": "2026-10-26T16:17:19.680", "references": [{"source": "disclosure@vulncheck.com", "url": "https://github.com/netty/netty-tcnative"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L2608"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-176"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "io.netty/netty-tcnative: netty-tcnative: Hostname spoofing via improper SNI character decoding", "id": "2560876", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2560876"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-1289", "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.", "A flaw was found in netty-tcnative. A remote, unauthenticated attacker can exploit this issue by sending a specially crafted Server Name Indication (SNI) hostname with overlong character encodings during a Transport Layer Security (TLS) handshake. This causes the application to decode the hostname inconsistently, resulting in hostname spoofing that can bypass access controls, trigger incorrect certificate selection, or falsify security audit logs."], "mitigation": {"lang": "en:us", "value": "Upgrade to netty-tcnative 2.0.84.Final (netty-tcnative-boringssl-static likewise); as a workaround, avoid using the decoded SNI hostname for security decisions, or validate/normalize it before use in access control, routing, or logging."}, "name": "CVE-2026-116542", "package_state": [{"cpe": "cpe:/a:redhat:camel_spring_boot:4", "fix_state": "Fix deferred", "package_name": "netty-tcnative", "product_name": "Red Hat build of Apache Camel for Spring Boot 4"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "netty-tcnative", "product_name": "Red Hat Fuse 7"}], "public_date": "2026-10-26T14:59:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-116542\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-116542\nhttps://github.com/netty/netty-tcnative\nhttps://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L2608\nhttps://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38\nhttps://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final\nhttps://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf\nhttps://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding"], "statement": "This vulnerability is rated as Moderate severity because, although exploitable remotely without credentials, it only impacts data integrity without directly exposing confidential information or causing denial of service. Applications bundling netty-tcnative are exposed when terminating TLS connections and relying on the SNI server name to drive routing, multi-tenant certificate selection, or access control policies. In typical Red Hat deployments where SNI is not used as a primary security boundary or where TLS termination is handled by upstream reverse proxies, the practical exposure is further reduced.", "threat_severity": "Moderate"}

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