Description
Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| netty | netty | >= 4.2.0.Final, < 4.2.16.Final, >= 4.1.0.Final, < 4.1.136.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 | No fix yet | — |
| Debian 13 | netty | No fix yet | — |
| Debian 12 | netty | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | netty | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 24.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 22.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 20.04 LTS | netty | No fix yet | — |
| Ubuntu Pro 18.04 LTS | netty | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | netty | 4.1.136-150200.4.53.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP7 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP6 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES for SAP 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLES for SAP 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLE HPC 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
| SLE HPC 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 | SUSE-SU-2026:3482-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | netty | 4.1.136-1.1 | openSUSE-SU-2026:11394-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | celeborn-0.6 | 0.6.3-r11 | — |
| Wolfi rolling | management-api-for-apache-cassandra-5.0 | 0.1.122-r2 | — |
| Wolfi rolling | tez | 0.10.5-r23 | — |
| Wolfi rolling | thingsboard-tb-node +1 | 4.3.1.3-r7 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | io.netty:netty-codec-xml | >= 4.2.0.Final, < 4.2.16.Final | 4.2.16.Final | GHSA-4qhr-g3c6-fcfx |
| Maven | io.netty:netty-codec-xml | >= 4.1.0.Final, < 4.1.136.Final | 4.1.136.Final | GHSA-4qhr-g3c6-fcfx |
Advisories 3
- WID-SEC-2026-2356 Netty: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2026
- SUSE-SU-2026:3482-1 Security update for netty, netty-tcnative SUSE / openSUSE Security Updates · Aug 5, 2026
- openSUSE-SU-2026:11394-1 netty-4.1.136-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
References
- https://github.com/netty/netty/security/advisories/GHSA-4qhr-g3c6-fcfx
- https://github.com/netty/netty/commit/5b68c61f37aa4a3045cba624cbea239655c9003b
- https://github.com/netty/netty/commit/bb2ff68a1fb71cb4b0eb9a9e17b66c52aff680c6
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Final