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Fencer Vulns
medium 5.9

CVE-2026-116540 json

netty-tcnative 2.0.66.Final before 2.0.84.Final Use-After-Free in Session Ticket Callback

published 2026-10-26 14 d ago modified 2026-10-26 13 d ago also EUVD-2026-109910

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

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

Patch / fix

  • netty netty-tcnative 2.0.84.Final
  • netty-tcnative openSUSE Tumbleweed 2.0.85-1.1

opensuse advisories openSUSE-SU-2026:12403-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-116540 updated cvss 5.9

io.netty/netty-tcnative: netty-tcnative: Denial of Service via use-after-free during session ticket key rotation

  • Red Hat build of Apache Camel for Spring Boot 4 netty-tcnative 2.0.81.Final-redhat-00001
    affected: no fix available “Fix deferred”
  • Red Hat Fuse 7 netty-tcnative 2.0.81.Final-redhat-00001
    affected: no fix planned “Out of support scope”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
14 d ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • netty netty-tcnative

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.