{"affected":[{"defaultStatus":"unaffected","ecosystem":"maven","packageName":"io.netty:netty-tcnative","product":"netty-tcnative","source":"CNA: VulnCheck","vendor":"netty","versions":[{"lessThan":"2.0.84.Final","status":"affected","version":"0","versionType":"custom"}]},{"defaultStatus":"unaffected","ecosystem":"maven","packageName":"io.netty:netty-tcnative-boringssl-static","product":"netty-tcnative-boringssl-static","source":"CNA: VulnCheck","vendor":"netty","versions":[{"lessThan":"2.0.84.Final","status":"affected","version":"0","versionType":"custom"}]}],"cveId":"CVE-2026-116539","cwes":["CWE-787"],"description":"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.","epss":{"date":"2026-11-02","percentile":0.33796,"score":0.00396},"exploits":[{"kind":"exploit","source":"ADP: CISA-ADP","url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh"}],"kev":null,"metrics":[{"score":8.2,"severity":"high","source":"CNA: VulnCheck","vector":"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","version":"4.0"},{"score":5.9,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1793641246434,"publishedAt":1793026779460,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8"},{"source":"CNA: VulnCheck","tags":["technical-description"],"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199"},{"source":"CNA: VulnCheck","tags":["release-notes"],"url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final"},{"source":"CNA: VulnCheck","tags":["product"],"url":"https://github.com/netty/netty-tcnative"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio"},{"source":"ADP: CISA-ADP","tags":["exploit"],"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8"}],"revision":"223823bb6fd8738cb58c63a21cd5adac549ee1073d7f21f77b8c5d6b9d63897e","sources":[{"modifiedAt":1793641246434,"name":"CNA: VulnCheck","retrievedAt":1793642953843,"url":"https://www.cve.org/CVERecord?id=CVE-2026-116539"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793642961116,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-116539"}],"ssvc":{"assessedAt":1793641215393,"automatable":"yes","exploitation":"poc","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO","updatedAt":1793642961116}