{"id":"CVE-2026-116541","title":"netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount","summary":"Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like Ne…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-682"],"vendor":"netty","product":"io.netty:netty-tcnative","affected":["io.netty:netty-tcnative < 2.0.84.Final","io.netty:netty-tcnative-boringssl-static < 2.0.84.Final"],"published":"2026-10-26","updated":"2026-10-26","sourceUpdated":"2026-10-26T14:59:40.847Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116541","references":[{"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489","label":"GitHub Security Advisory (GHSA-9xr3-jwv4-r489)"},{"url":"https://github.com/netty/netty-tcnative/commit/e31df4a5885b35085fdfa3e2dca7c1f705d4745b","label":"Patch Commit"},{"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/ssl.c#L240"},{"url":"https://github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final","label":"netty-tcnative netty-tcnative-parent-2.0.84.Final Release Notes"},{"url":"https://github.com/netty/netty-tcnative"},{"url":"https://www.vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-service-via-bio-write-overcount","label":"VulnCheck Advisory: netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount"}],"tags":["cve.org"],"ingestedAt":"2026-10-26T15:29:30.503Z","slug":"CVE-2026-116541","body":"## Overview\n\nNetty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.\n\n## Affected\n\n- `io.netty:netty-tcnative < 2.0.84.Final`\n- `io.netty:netty-tcnative-boringssl-static < 2.0.84.Final`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}