---
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'
---

## Overview

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 setSessionTicketKeys0 frees the shared key array cause OpenSSL to read freed HMAC keys, crashing or corrupting ticket processing.

## Affected

- `io.netty:netty-tcnative >= 2.0.66.Final < 2.0.84.Final`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.