CVE-2026-56817
Fixed in a distro release EPSS <1%CVSS 8.3
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.
Products: netty
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Maven | io.netty:netty-codec-xml | 4.2.16.Final |
| Maven | io.netty:netty-codec-xml | 4.1.136.Final |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | apache-hop | 2.18.1-r8 |
| Chainguard | apache-hop-fips | 2.18.1-r6 |
| Chainguard | celeborn-0.5 | 0.5.4-r30 |
| Chainguard | celeborn-0.6 | 0.6.3-r11 |
| Chainguard | gremlin-server | 3.8.1-r2 |
| Chainguard | hadoop-3.5 | no fix |
| Chainguard | hadoop-fips-3.3.6 | no fix |
| Chainguard | hadoop-fips-3.4.2 | no fix |
| Chainguard | hadoop-fips-3.5 | no fix |
| Chainguard | hadoop-fips-3.5 | 3.5.0-r3 |
| Chainguard | management-api-for-apache-cassandra-5.0 | 0.1.122-r2 |
| Chainguard | pinot | 1.5.1-r4 |
| Chainguard | pinot-fips | 1.5.1-r4 |
| Chainguard | ranger | no fix |
| Chainguard | seata-server | 2.6.0-r21 |
| Chainguard | tez | 0.10.5-r23 |
| Chainguard | thingsboard-tb-mqtt-transport | 4.3.1.3-r7 |
| Chainguard | thingsboard-tb-node | 4.3.1.3-r7 |
| Debian 12 | netty | no fix |
| Debian 13 | netty | no fix |
| Debian 14 | netty | no fix |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Module for Development Tools 15 SP7 | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | netty | 4.1.136-150200.4.53.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server 15 SP5-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server 15 SP6-LTSS | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | netty-tcnative | 2.0.80-150200.3.48.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | netty-tcnative | 2.0.80-150200.3.48.1 |
| Ubuntu 26.10 | netty | no fix |
| Ubuntu Pro 14.04 LTS | netty | no fix |
| Ubuntu Pro 16.04 LTS | netty | no fix |
| Ubuntu Pro 18.04 LTS | netty | no fix |
| Ubuntu Pro 20.04 LTS | netty | no fix |
| Ubuntu Pro 22.04 LTS | netty | no fix |
| Ubuntu Pro 24.04 LTS | netty | no fix |
| Ubuntu Pro 26.04 LTS | netty | no fix |
| Wolfi | celeborn-0.6 | 0.6.3-r11 |
| Wolfi | management-api-for-apache-cassandra-5.0 | 0.1.122-r2 |
| Wolfi | tez | 0.10.5-r23 |
| Wolfi | thingsboard-tb-mqtt-transport | 4.3.1.3-r7 |
| Wolfi | thingsboard-tb-node | 4.3.1.3-r7 |
| openSUSE Tumbleweed | netty | 4.1.136-1.1 |