# CVE-2026-42579: eap8-eap-product-conf-parent: Netty is an asynchronous, event-driven network application framework

CVE-2026-42579 is fixed in 9 products on 1 platform, first by libnetty-buffer-java 1:4.1.48-16ubuntu0.1~esm2, released May 13, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-42579
- Priority: High
- CVSS: 7.5 (important)
- EPSS: 0.0101
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 13, 2026

## Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | eap8-eap-product-conf-parent RHEL 10 | 801.7.1-1.GA_redhat_00001.1.el10eap | [RHSA-2026:49700](https://patchblox.com/security/data/fix/linux/rhsa-2026-49700.md) | Jun 12, 2026 |
| Linux | eap8-netty RHEL 10 | 4.1.135-1.Final_redhat_00001.1.el10eap | [RHSA-2026:49700](https://patchblox.com/security/data/fix/linux/rhsa-2026-49700.md) | Jun 12, 2026 |
| Linux | eap8-netty-transport-native-epoll RHEL 10 | 4.1.135-1.Final_redhat_00001.1.el10eap | [RHSA-2026:49700](https://patchblox.com/security/data/fix/linux/rhsa-2026-49700.md) | Jun 12, 2026 |
| Linux | eap8-wildfly RHEL 10 | 8.1.7.1-1.GA_redhat_00004.1.el10eap | [RHSA-2026:49700](https://patchblox.com/security/data/fix/linux/rhsa-2026-49700.md) | Jun 12, 2026 |
| Linux | libnetty-buffer-java Ubuntu 26.04.1 LTS (resolute) | 1:4.1.48-16ubuntu0.1~esm2 | [libnetty-buffer-java 1:4.1.48-16ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libnetty-buffer-java-1-4.1.48-16ubuntu0.1-esm2.md) | May 13, 2026 |
| Linux | libnetty-common-java Ubuntu 26.04.1 LTS (resolute) | 1:4.1.48-16ubuntu0.1~esm2 | [libnetty-common-java 1:4.1.48-16ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libnetty-common-java-1-4.1.48-16ubuntu0.1-esm2.md) | May 13, 2026 |
| Linux | libnetty-java Ubuntu 20.04 LTS (focal) | 1:4.1.45-1ubuntu0.1~esm6 | [libnetty-java 1:4.1.45-1ubuntu0.1~esm6](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libnetty-java-1-4.1.45-1ubuntu0.1-esm6.md) | May 13, 2026 |
| Linux | libnetty-java Ubuntu 22.04.1 LTS (jammy) | 1:4.1.48-4+deb11u2ubuntu0.1+esm3 | [libnetty-java 1:4.1.48-4+deb11u2ubuntu0.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libnetty-java-1-4.1.48-4-deb11u2ubuntu0.1-esm3.md) | May 13, 2026 |
| Linux | libnetty-java Ubuntu 24.04.5 LTS (noble) | 1:4.1.48-9ubuntu0.1+esm3 | [libnetty-java 1:4.1.48-9ubuntu0.1+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libnetty-java-1-4.1.48-9ubuntu0.1-esm3.md) | May 13, 2026 |
| Linux | libnetty-java Ubuntu 26.04.1 LTS (resolute) | 1:4.1.48-16ubuntu0.1~esm2 | [libnetty-java 1:4.1.48-16ubuntu0.1~esm2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libnetty-java-1-4.1.48-16ubuntu0.1-esm2.md) | May 13, 2026 |
| Linux | netty sles 15.7 | 4.1.133-150200.4.46.1 | [SUSE-SU-2026:2308-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2308-1.md) | Jun 9, 2026 |
| Linux | netty-tcnative sles 15.6 | 2.0.77-150200.3.39.1 | [SUSE-SU-2026:2308-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2308-1.md) | Jun 9, 2026 |
| Linux | netty-tcnative sles 15.7 | 2.0.77-150200.3.39.1 | [SUSE-SU-2026:2308-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2308-1.md) | Jun 9, 2026 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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