{"id":"CVE-2026-116539","state":"PUBLISHED","title":"Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO","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.","publishedAt":"2026-10-26T14:59:39.460Z","updatedAt":"2026-10-26T14:59:39.460Z","severity":{"score":8.2,"label":"High","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["netty netty-tcnative","netty netty-tcnative-boringssl-static"],"affected":[{"vendor":"netty","product":"netty-tcnative","packageName":"io.netty:netty-tcnative","packageURL":"pkg:maven/io.netty/netty-tcnative","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.0.84.Final","versionType":"custom"}],"collectionURL":"https://repo1.maven.org/maven2/io/netty/netty-tcnative/","repo":"https://github.com/netty/netty-tcnative"},{"vendor":"netty","product":"netty-tcnative-boringssl-static","packageName":"io.netty:netty-tcnative-boringssl-static","packageURL":"pkg:maven/io.netty/netty-tcnative-boringssl-static","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"2.0.84.Final","versionType":"custom"}],"collectionURL":"https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/","repo":"https://github.com/netty/netty-tcnative"}],"references":["https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh","https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8","https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199","https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final","https://github.com/netty/netty-tcnative","https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/116xxx/CVE-2026-116539.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-116539","state":"PUBLISHED","datePublished":"2026-10-26T14:59:39.460Z","dateUpdated":"2026-10-26T14:59:39.460Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-26T14:30:57.254Z"},"containers":{"cna":{"title":"Netty netty-tcnative before 2.0.84.Final Heap Buffer Overflow via OpenSSL BIO","descriptions":[{"lang":"en","value":"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. 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