CVE-2026-116541
netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
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
What each source reports
CVE List Score used
netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
CVE-2026-116541- CVSS 4.0
- 8.2 High
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 - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-682
- Updated
- 2026-11-02
EUVDEUVD-2026-109911
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
EUVD-2026-109911- CVSS 4.0
- 8.2 High
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-rm79-885g-92ch
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the...
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
GHSA-rm79-885g-92ch- CVSS 4.0
- 8.2 High
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 - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-682
- Updated
- 2026-11-02
NVD
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
CVE-2026-116541- CVSS 4.0
- 8.2 High
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 - CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-682
- Updated
- 2026-11-02
OSV
netty-tcnative before 2.0.84.Final Denial of Service via BIO Write Overcount
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
CVE-2026-116541- CVSS 4.0
- 8.2 High
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 - Weakness
- CWE-682
- Updated
- 2026-11-04
OSVDEBIAN-CVE-2026-116541
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
DEBIAN-CVE-2026-116541- CVSS 4.0
- 8.2 High
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 - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-116541
Netty netty-tcnative before 2.0.84.Final contains a denial of service vulnerability in the tcn_write_to_bytebuffer BIO write callback that overreports bytes consumed. Remote TLS 1.3 peers can provoke queued post-handshake records like NewSessionTicket or KeyUpdate to truncate flights, fail connections, or abort the JVM process.
- Record
UBUNTU-CVE-2026-116541- CVSS 4.0
- 8.2 High
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 - CVSS 3.1
- 5.9 Medium
CVSS: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
| Package | Affected | Fixed |
|---|---|---|
netty-tcnativeDebian:12 |
All versions, plus listed versions 2.0.28-1 |
None known |
netty-tcnativeDebian:13 |
All versions, plus listed versions 2.0.28-1 |
None known |
netty-tcnativeDebian:14 |
All versions, plus listed versions 2.0.28-1 |
None known |
netty-tcnativeUbuntu:16.04:LTS |
All versions, plus listed versions 1.1.33.Fork6-11.1.33.Fork10-21.1.33.Fork14-1 |
None known |
netty-tcnativeUbuntu:18.04:LTS |
All versions, plus listed versions 1.1.33.Fork26-11.1.33.Fork26-1build1 |
None known |
netty-tcnativeUbuntu:20.04:LTS |
All versions, plus listed versions 2.0.20-12.0.28-1 |
None known |
netty-tcnativeUbuntu:22.04:LTS |
All versions, plus listed versions 2.0.28-12.0.28-1build1 |
None known |
netty-tcnativeUbuntu:24.04:LTS |
All versions, plus listed versions 2.0.28-1build12.0.28-1build22.0.28-1build32.0.28-1build4 |
None known |
netty-tcnativeUbuntu:26.10 |
All versions, plus listed versions 2.0.28-1build52.0.28-1build6 |
None known |
netty-tcnativeUbuntu:26.04:LTS |
All versions, plus listed versions 2.0.28-1build42.0.28-1build5 |
None known |
netty-tcnativeopenSUSE:Tumbleweed |
before 2.0.85-1.1 | 2.0.85-1.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, aliases, facts, references | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-116541 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 0.49%, the 42nd percentile. Fixed in netty-tcnative 2.0.85-1.1.
References
github.com/netty/netty-tcnative/security/advisories/GHSA-9xr3-jwv4-r489
vulncheck.com/advisories/netty-tcnative-before-2.0.84-final-denial-of-service-via-bio-write-overcount
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nvd.nist.gov/vuln/detail/CVE-2026-116541
repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static
security-tracker.debian.org/tracker/CVE-2026-116541
ubuntu.com/security/CVE-2026-116541
cve.org/CVERecord?id=CVE-2026-116541
suse.com/security/cve/CVE-2026-116539