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{"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"}