Description
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. The `SniHandler` can allocate up to 16MB of heap for each channel during the TLS handshake. When the handler or the channel does not have an idle timeout, it can be used to make a TCP server using the `SniHandler` to allocate 16MB of heap. The `SniHandler` class is a handler that waits for the TLS handshake to configure a `SslHandler` according to the indicated server name by the `ClientHello` record. For this matter it allocates a `ByteBuf` using the value defined in the `ClientHello` record. Normally the value of the packet should be smaller than the handshake packet but there are not checks done here and the way the code is written, it is possible to craft a packet that makes the `SslClientHelloHandler`. This vulnerability has been fixed in version 4.1.94.Final.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty | < 4.1.94.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 | 1:4.1.48-8 | — |
| Debian 13 | netty | 1:4.1.48-8 | — |
| Debian 12 | netty | 1:4.1.48-7+deb12u1 | DSA-5558-1 |
| Debian 11 | netty | 1:4.1.48-4+deb11u2 | DSA-5558-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | netty | No fix yet | — |
| Ubuntu 25.10 | netty | No fix yet | — |
| Ubuntu 24.04 LTS | netty | 1:4.1.48-9 | — |
| Ubuntu 22.04 LTS | netty | 1:4.1.48-4+deb11u2build0.22.04.1 | USN-6994-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | netty | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat JBoss EAP 7 | eap7-activemq-artemis +15 | 2.16.0-15.redhat_00049.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-bouncycastle +5 | 1.76.0-4.redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-hal-console | 3.3.19-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-hibernate +4 | 5.3.31-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-ironjacamar +8 | 1.5.15-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-jboss-marshalling +1 | 2.0.13-2.SP1_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-jboss-modules | 1.12.2-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-jboss-server-migration +2 | 1.10.0-31.Final_redhat_00030.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-jboss-xnio-base | 3.8.10-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-mod_cluster | 1.4.5-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-netty +28 | 4.1.94-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-resteasy +18 | 3.15.8-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-undertow | 2.2.26-1.SP1_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-wildfly +4 | 7.4.13-8.GA_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-wildfly-elytron +1 | 1.15.20-1.Final_redhat_00001.1.el7eap | RHSA-2023:5486, RHSA-2023:5485, RHSA-2023:5484 |
| Red Hat JBoss EAP 7 | eap7-wildfly-java-jdk17 | 7.4.13-8.GA_redhat_00001.1.el8eap | RHSA-2023:5486, RHSA-2023:5485 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | netty | 4.1.94-150200.4.17.1 | SUSE-SU-2023:2974-1 |
| SLES 15 SP5 | netty-tcnative | 2.0.61-150200.3.13.1 | SUSE-SU-2023:2974-1 |
| SLES 15 SP4 | netty-tcnative | 2.0.61-150200.3.13.1 | SUSE-SU-2023:2974-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Real Time 15 SP3 | netty-tcnative | 2.0.61-150200.3.13.1 | SUSE-SU-2023:2974-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty | 4.1.114-1.1 | openSUSE-SU-2024:14442-1 |
| openSUSE Leap 15.5 | netty | 4.1.94-150200.4.17.1 | SUSE-SU-2023:2974-1 |
| openSUSE Leap 15.5 | netty-tcnative | 2.0.61-150200.3.13.1 | SUSE-SU-2023:2974-1 |
| openSUSE Leap 15.4 | netty | 4.1.94-150200.4.17.1 | SUSE-SU-2023:2974-1 |
| openSUSE Leap 15.4 | netty-tcnative | 2.0.61-150200.3.13.1 | SUSE-SU-2023:2974-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | cloudwatch-exporter | 0.15.4-r2 | — |
| Wolfi rolling | docker-selenium-standalone-chrome | No fix yet | — |
| Wolfi rolling | wavefront-proxy | 13.1-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.netty:netty-handler | < 4.1.94.Final | 4.1.94.Final | GHSA-6mjq-h674-j845 |
Advisories 24
- RHSA-2023:5486 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.13 security update on RHEL 9 Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2023:5484 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.13 security update on RHEL 7 Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2023:5485 Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.4.13 security update on RHEL 8 Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- USN-6994-1 netty vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5558-1 netty - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:2974-1 Security update for netty, netty-tcnative SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1459 Dell Data Protection Advisor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 3, 2025
- openSUSE-SU-2024:14442-1 netty-4.1.114-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2023-3072 Red Hat Enterprise Linux(Cryostat): Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 17, 2024
- WID-SEC-2024-3684 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 11, 2024
- WID-SEC-2023-2518 Red Hat JBoss Data Grid: Mehre Schwachstellen BSI CERT-Bund (WID) · Jul 1, 2024
- WID-SEC-2024-0113 Oracle Utilities Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 19, 2024
- WID-SEC-2024-0519 IBM Maximo Asset Management: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 29, 2024
- WID-SEC-2024-0109 Oracle NoSQL Database: Schwachstelle gefährdet Verfügbarkeit BSI CERT-Bund (WID) · Jan 16, 2024
- WID-SEC-2023-2674 Oracle Fusion Middleware: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 26, 2023
- WID-SEC-2023-3025 IBM InfoSphere Information Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 4, 2023
- WID-SEC-2023-2774 IBM Maximo Asset Management: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Oct 29, 2023
- WID-SEC-2023-2689 Oracle PeopleSoft: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-2682 Oracle TimesTen In-Memory Database: Schwachstelle gefährdet Verfügbarkeit BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-2680 Oracle Communications Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-2679 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-2675 Oracle Financial Services Applications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 17, 2023
- WID-SEC-2023-1961 NetApp ActiveIQ Unified Manager: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 4, 2023
References
- https://github.com/netty/netty/security/advisories/GHSA-6mjq-h674-j845
- https://github.com/netty/netty/commit/535da17e45201ae4278c0479e6162bb4127d4c32
- https://security.netapp.com/advisory/ntap-20230803-0001/
- https://www.debian.org/security/2023/dsa-5558
- https://security.netapp.com/advisory/ntap-20240621-0007/