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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty-tcnative | 2.0.66.Final – < 2.0.84.Final | 2.0.84.Final |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | netty-tcnative | No fix yet | — |
| Debian 13 | netty-tcnative | No fix yet | — |
| Debian 12 | netty-tcnative | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | netty-tcnative | No fix yet | — |
| Ubuntu 26.04 LTS | netty-tcnative | No fix yet | — |
| Ubuntu 24.04 LTS | netty-tcnative | No fix yet | — |
| Ubuntu 22.04 LTS | netty-tcnative | No fix yet | — |
| Ubuntu 20.04 LTS | netty-tcnative | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | netty-tcnative | No fix yet | — |
| Ubuntu 16.04 LTS | netty-tcnative | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty-tcnative | 2.0.85-1.1 | openSUSE-SU-2026:12403-1 |
Advisories 1
- openSUSE-SU-2026:12403-1 netty-tcnative-2.0.85-1.1 on GA media SUSE / openSUSE Security Updates · Nov 4, 2026
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