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CVE-2026-116540

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

8.2 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.46%Unchanged since Oct 27, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.2

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

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.

Record
CVE-2026-116540
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-416
Updated
2026-11-02
EUVDEUVD-2026-109910 8.2

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.

Record
EUVD-2026-109910
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-fgcj-53j7-r6vq 8.2

netty-tcnative 2.0.66.Final before 2.0.84.Final built against OpenSSL 3.x contains a use-after...

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.

Record
GHSA-fgcj-53j7-r6vq
CVSS 4.0
8.2 HighCVSS: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
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-416
Updated
2026-11-02
NVD 8.2

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.

Record
CVE-2026-116540
CVSS 4.0
8.2 HighCVSS: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
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-416
Updated
2026-11-02
OSV 8.2

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

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.

Record
CVE-2026-116540
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-416
Updated
2026-11-04
OSVDEBIAN-CVE-2026-116540 8.2

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.

Record
DEBIAN-CVE-2026-116540
CVSS 4.0
8.2 HighCVSS: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
Updated
2026-11-02
OSVUBUNTU-CVE-2026-116540 8.2

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.

Record
UBUNTU-CVE-2026-116540
CVSS 4.0
8.2 HighCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:12403-1 No score

netty-tcnative-2.0.85-1.1 on GA media

These are all security issues fixed in the netty-tcnative-2.0.85-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12403-1
Updated
2026-11-04

Affected products

Affected packages

Affected packages
PackageAffectedFixed
netty-tcnative
Debian:12
 All versions, plus listed versions
2.0.28-1
 None known
netty-tcnative
Debian:13
 All versions, plus listed versions
2.0.28-1
 None known
netty-tcnative
Debian:14
 All versions, plus listed versions
2.0.28-1
 None known
netty-tcnative
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.1.33.Fork6-11.1.33.Fork10-21.1.33.Fork14-1
 None known
netty-tcnative
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.1.33.Fork26-11.1.33.Fork26-1build1
 None known
netty-tcnative
Ubuntu:20.04:LTS
 All versions, plus listed versions
2.0.20-12.0.28-1
 None known
netty-tcnative
Ubuntu:22.04:LTS
 All versions, plus listed versions
2.0.28-12.0.28-1build1
 None known
netty-tcnative
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.0.28-1build12.0.28-1build22.0.28-1build32.0.28-1build4
 None known
netty-tcnative
Ubuntu:26.10
 All versions, plus listed versions
2.0.28-1build52.0.28-1build6
 None known
netty-tcnative
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.0.28-1build42.0.28-1build5
 None known
netty-tcnative
openSUSE:Tumbleweed
 before 2.0.85-1.1
2.0.85-1.1

History

History
RecordedChangedSources
affected, aliases, facts, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-116540 is a high vulnerability (CVSS 8.2) in Netty Netty-tcnative, published October 26, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.46%, the 39th percentile. Fixed in netty-tcnative 2.0.85-1.1.

References

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