{"id":"CVE-2026-116540","title":"netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback","summary":"netty-tcnative 2.0.66.Final before 2.0.84.Final built against OpenSSL 3.x contains a use-after-free vulnerability in ssl_tlsext_ticket_key_cb during session ticket key rotation. Remote clients performing TLS handshakes while setSessionTi…","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-416"],"vendor":"netty","product":"io.netty:netty-tcnative","affected":["io.netty:netty-tcnative >= 2.0.66.Final < 2.0.84.Final"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-26T15:38:07.789293Z"},"published":"2026-10-26","updated":"2026-10-26","sourceUpdated":"2026-10-26T16:15:16.184Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116540","references":[{"url":"https://github.com/netty/netty-tcnative/security/advisories/GHSA-mmc8-vg2v-fvvw","label":"GitHub Security Advisory (GHSA-mmc8-vg2v-fvvw)"},{"url":"https://github.com/netty/netty-tcnative/commit/59662a8b07a9a7623ae1bc472f5751f31c81a118","label":"Patch Commit"},{"url":"https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L1365"},{"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-2.0.66-final-before-2.0.84-final-use-after-free-in-session-ticket-callback","label":"VulnCheck Advisory: netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback"}],"tags":["cve.org"],"ingestedAt":"2026-10-26T15:29:30.502Z","slug":"CVE-2026-116540","body":"## Overview\n\nnetty-tcnative 2.0.66.Final before 2.0.84.Final built against OpenSSL 3.x contains a use-after-free vulnerability in ssl_tlsext_ticket_key_cb during session ticket key rotation. Remote clients performing TLS handshakes while setSessionTicketKeys0 frees the shared key array cause OpenSSL to read freed HMAC keys, crashing or corrupting ticket processing.\n\n## Affected\n\n- `io.netty:netty-tcnative >= 2.0.66.Final < 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":[]}