CVE-2026-116540
CVE-2026-116540
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/netty/netty-tcnative/security/advisories/GHSA-mmc8-vg2v-fvvw (vendor-advisory)
- github.com/netty/netty-tcnative/commit/59662a8b07a9a7623ae1bc472f5751f31c81a118 (patch)
- github.com/netty/netty-tcnative/blob/netty-tcnative-parent-2.0.83.Final/openssl… (technical-description)
- github.com/netty/netty-tcnative/releases/tag/netty-tcnative-parent-2.0.84.Final (release-notes)
- github.com/netty/netty-tcnative (product)
- www.vulncheck.com/advisories/netty-tcnative-2.0.66-final-before-2.0.84-final-us… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116540?
- CVE-2026-116540 is a medium-severity vulnerability, classified under Use After Free. CVSS score: 5.9/10. Published 2026-10-26.
- How severe is CVE-2026-116540?
- Medium severity. CVSS v3 base score is 5.9 out of 10.