# CVE-2026-42584: eap8-eap-product-conf-parent: Netty is an asynchronous, event-driven network application framework

CVE-2026-42584 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-2026-42584
- Priority: High
- CVSS: 7.3 (important)
- EPSS: 0.0084
- 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, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. 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 18.04.6 LTS (bionic) | 1:4.1.7-4ubuntu0.1+esm6 | [libnetty-java 1:4.1.7-4ubuntu0.1+esm6](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libnetty-java-1-4.1.7-4ubuntu0.1-esm6.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 2026-11-08T13:06:02Z 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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