# CVE-2026-47691: eap8-eap-product-conf-parent: Netty is a network application framework for development of protocol servers and clients

CVE-2026-47691 is fixed in 7 products on 1 platform, first by libnetty-java 1:4.1.48-9ubuntu0.2+esm2, released June 12, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-47691
- Priority: High
- CVSS: 8.7 (important)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 12, 2026

## Description

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's `DnsResolveContext` insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like `.co.uk`). In `io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add` method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the `handleWithAdditional` method caches the associated A records from the ADDITIONAL section directly into the `authoritativeDnsServerCache` under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

## 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-java Ubuntu 24.04.5 LTS (noble) | 1:4.1.48-9ubuntu0.2+esm2 | [libnetty-java 1:4.1.48-9ubuntu0.2+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libnetty-java-1-4.1.48-9ubuntu0.2-esm2.md) | Jun 12, 2026 |
| Linux | netty sles 15.7 | 4.1.135-150200.4.50.1 | [SUSE-SU-2026:2802-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2802-1.md) | Jul 8, 2026 |
| Linux | netty-tcnative sles 15.6 | 2.0.79-150200.3.45.1 | [SUSE-SU-2026:2802-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2802-1.md) | Jul 8, 2026 |
| Linux | netty-tcnative sles 15.7 | 2.0.79-150200.3.45.1 | [SUSE-SU-2026:2802-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-2802-1.md) | Jul 8, 2026 |

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Data as of 2026-11-09T01:18:40Z 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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