CVE-2026-116539

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Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes the JVM process."}], "id": "CVE-2026-116539", "lastModified": "2026-11-02T18:18:43.410", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "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:P/PR:N/UI:N/VC:N/VI:N/VA:H/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-116539", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-02T17:40:15.393220Z", "version": "2.0.3"}}]}, "published": "2026-10-26T16:17:19.200", "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/ssl.c#L199"}, {"source": "disclosure@vulncheck.com", "url": "https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8"}, {"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-gf9q-9mg7-g5qh"}, {"source": "disclosure@vulncheck.com", "url": "https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "io.netty/netty-tcnative: netty-tcnative: Denial of Service via heap buffer overflow", "id": "2560878", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2560878"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["Netty netty-tcnative before 2.0.84.Final contains a heap buffer overflow vulnerability in the tcn_write_to_bytebuffer BIO callback caused by failing to wrap the non-application ring buffer write index. Remote TLS peers can drive handshake, renegotiation, or post-handshake messages into this buffer, triggering an out-of-bounds memcpy that crashes the JVM process.", "A flaw was found in netty-tcnative. A remote attacker can cause a denial of service (DoS) by sending specially crafted Transport Layer Security (TLS) messages. Due to improper buffer index handling, incoming data triggers a heap-based buffer overflow and an out-of-bounds memory write, which crashes the Java Virtual Machine (JVM) process."], "mitigation": {"lang": "en:us", "value": "Upgrade netty-tcnative to 2.0.84.Final or later, where the ring-buffer write index is wrapped via modulo of nonApplicationBufferSize in tcn_write_to_bytebuffer (commit 92dd66f). As an interim measure, a larger nonApplicationBufferSize reduces the likelihood of triggering the overflow but is not a fix."}, "name": "CVE-2026-116539", "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": "2026-10-26T14:59:39Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-116539\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-116539\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/ssl.c#L199\nhttps://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8\nhttps://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final\nhttps://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh\nhttps://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio"], "statement": "Red Hat rates the impact of this vulnerability as Moderate because it is restricted to causing a service crash without compromising system confidentiality or data integrity, despite being remotely triggerable without authentication. In Red Hat environments, netty-tcnative is utilized within Java integration runtimes, such as Red Hat JBoss Fuse and Red Hat build of Apache Camel, to provide native OpenSSL-accelerated TLS handling. Successful exploitation requires an active TLS handshake or renegotiation session where non-standard control messages are delivered, resulting in service disruption rather than privilege escalation.", "threat_severity": "Moderate"}

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