Vulnerability · Published Oct 26, 2026 · Assigned by VulnCheck
CVE-2026-116540netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback
Medium 5.9
In plain English
A medium-severity use-after-free in netty-tcnative from netty. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.5%top 60.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | netty-tcnative | no fix listed | DEBIAN-CVE-2026-116540 |
| Debian:13 | netty-tcnative | no fix listed | DEBIAN-CVE-2026-116540 |
| Debian:14 | netty-tcnative | no fix listed | DEBIAN-CVE-2026-116540 |
| Ubuntu:22.04:LTS | netty-tcnative | no fix listed | UBUNTU-CVE-2026-116540 |
| Ubuntu:24.04:LTS | netty-tcnative | no fix listed | UBUNTU-CVE-2026-116540 |
| Ubuntu:26.04:LTS | netty-tcnative | no fix listed | UBUNTU-CVE-2026-116540 |
| Ubuntu:26.10 | netty-tcnative | no fix listed | UBUNTU-CVE-2026-116540 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| netty | netty-tcnative | 2.0.66.Final – before 2.0.84.Final |
Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-mmc8-vg2v-fvvw) vendor-advisory
- Patch Commit patch
- https://github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl-dynamic/src/main/c/sslcontext.c#L1365 technical-description
- netty-tcnative netty-tcnative-parent-2.0.84.Final Release Notes release-notes
- https://github.com/netty/netty-tcnative product
- VulnCheck Advisory: netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback third-party-advisory