{"id":"CVE-2026-116539","aliases":["DEBIAN-CVE-2026-116539","EUVD-2026-109909","GHSA-22qq-f4wc-4vfx","GHSA-gf9q-9mg7-g5qh","UBUNTU-CVE-2026-116539","openSUSE-SU-2026:12403-1"],"status":"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.","severity":{"version":"4.0","score":8.2,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00396,"percentile":0.34273,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-10-26T14:59:39Z","modified":"2026-11-04T17:27:18Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1"]},{"source":"osv","ecosystem":"Debian:13","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1"]},{"source":"osv","ecosystem":"Debian:14","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.33.Fork6-1","1.1.33.Fork10-2","1.1.33.Fork14-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.33.Fork26-1","1.1.33.Fork26-1build1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.20-1","2.0.28-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1","2.0.28-1build1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1build1","2.0.28-1build2","2.0.28-1build3","2.0.28-1build4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1build5","2.0.28-1build6"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.28-1build4","2.0.28-1build5"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"netty-tcnative","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.85-1.1"}]}],"bundled":4}],"products":[{"vendor":"netty","product":"netty-tcnative"},{"vendor":"netty","product":"netty-tcnative-boringssl-static"}],"references":[{"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-gf9q-9mg7-g5qh","tags":["vendor-advisory","exploit","advisory"]},{"url":"https://github.com/netty/netty-tcnative/commit/92dd66fd1243d85c05a61288f96367a70260b6b8","tags":["patch","fix","report"]},{"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L199","tags":["technical-description","article"]},{"url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final","tags":["release-notes","advisory"]},{"url":"https://github.com/netty/netty-tcnative","tags":["product","package","report"]},{"url":"https://www.vulncheck.com/advisories/netty-netty-tcnative-before-2.0.84-final-heap-buffer-overflow-via-openssl-bio","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116539","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-22qq-f4wc-4vfx"},{"url":"https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/","tags":["web"]},{"url":"https://repo1.maven.org/maven2/io/netty/netty-tcnative/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116539.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-116539","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-116539","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-116539","tags":["report"]},{"url":"https://repo1.maven.org/maven2/io/netty/netty-tcnative","tags":["report"]},{"url":"https://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static","tags":["report"]},{"url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/116xxx/cve-2026-116539.json","tags":["report"]},{"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.final/openssl-dynamic/src/main/c/ssl.c#l199","tags":["report"]},{"url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.final","tags":["report"]},{"url":"https://github.com/netty/netty-tcnative/security/advisories/ghsa-gf9q-9mg7-g5qh","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/cve-2026-116539","tags":["report"]},{"url":"https://security-tracker.debian.org/tracker/cve-2026-116539","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-116539","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-116540","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-116541","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-116542","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-116539","title":"Netty 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