{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-116542", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-26T14:30:58.474Z", "datePublished": "2026-10-26T14:59:41.528Z", "dateUpdated": "2026-10-26T14:59:41.528Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-26T14:59:41.528Z"}, "datePublic": "2026-08-07T00:00:00.000Z", "title": "Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Handling of Unicode Encoding", "cweId": "CWE-176", "type": "CWE"}]}], "affected": [{"vendor": "netty", "product": "netty-tcnative", "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative/", "packageName": "io.netty:netty-tcnative", "repo": "https://github.com/netty/netty-tcnative", "defaultStatus": "unaffected", "packageURL": "pkg:maven/io.netty/netty-tcnative", "versions": [{"version": "0", "lessThan": "2.0.84.Final", "status": "affected", "versionType": "custom"}]}, {"vendor": "netty", "product": "netty-tcnative-boringssl-static", "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/", "packageName": "io.netty:netty-tcnative-boringssl-static", "repo": "https://github.com/netty/netty-tcnative", "defaultStatus": "unaffected", "packageURL": "pkg:maven/io.netty/netty-tcnative-boringssl-static", "versions": [{"version": "0", "lessThan": "2.0.84.Final", "status": "affected", "versionType": "custom"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.9, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/netty/netty-tcnative/security/advisories/GHSA-2784-hxmm-4hgf", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-2784-hxmm-4hgf)"}, {"url": "https://github.com/netty/netty-tcnative/commit/a879c85b9776cf478aada3ca69e60b8c0a99ed38", "tags": ["patch"], "name": "Patch Commit"}, {"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"]}, {"url": "https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final", "tags": ["release-notes"], "name": "netty-tcnative netty-tcnative-parent-2.0.84.Final Release Notes"}, {"url": "https://github.com/netty/netty-tcnative", "tags": ["product"]}, {"name": "VulnCheck Advisory: Netty netty-tcnative before 2.0.84.Final SNI Hostname Spoofing via Modified UTF-8 Decoding", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-sni-hostname-spoofing-via-modified-utf-8-decoding"}], "credits": [{"lang": "en", "value": "Yu Bao, PayPal Cyber Security Team", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative/", "defaultStatus": "unaffected", "packageName": "io.netty:netty-tcnative", "packageURL": "pkg:maven/io.netty/netty-tcnative", "product": "netty-tcnative", "repo": "https://github.com/netty/netty-tcnative", "vendor": "netty", "versions": [{"lessThan": "2.0.84.Final", "status": "affected", "version": "0", "versionType": "custom"}]}, {"collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/", "defaultStatus": "unaffected", "packageName": "io.netty:netty-tcnative-boringssl-static", "packageURL": "pkg:maven/io.netty/netty-tcnative-boringssl-static", "product": "netty-tcnative-boringssl-static", "repo": "https://github.com/netty/netty-tcnative", "vendor": "netty", "versions": [{"lessThan": "2.0.84.Final", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "disclosure@vulncheck.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-116542", "lastModified": "2026-10-26T16:54:08.707", "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": "Primary"}], "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"}]}, "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"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-176"}], "source": "disclosure@vulncheck.com", "type": "Primary"}]}

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