CVE-2026-42579Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)
Updated under an hour ago ()
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It affects netty and 21 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-20, CWE-400, CWE-626, CWE-1286
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Modified
- Record last updated
- Sep 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
netty netty netty:netty (from the name) | from 4.2.0.Alpha1, < 4.2.13.Final; before 4.1.133.Final | CNA record |
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat | from 4.2.0-10 not affected | CISA ADP |
Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 redhat:apache_camel_spring_boot | from codec-dns not affected | CISA ADP |
Red Hat Red Hat build of Quarkus 3.27.4 redhat:quarkus | from codec-dns not affected | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els | from 0:2.16.0-22.redhat_00057.1.el7eap not affected | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA redhat:jboss_enterprise_application_platform | from 4.1.135.Final-redhat-00001 not affected | CISA ADP |
Red Hat Streams for Apache Kafka 3.2.1 redhat:amq_streams | from codec-dns not affected | CISA ADP |
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai | from 1788198681 not affected | CISA ADP |
Red Hat Red Hat OpenShift Dev Spaces 3.28 redhat:openshift_devspaces | from 1780948325 not affected | CISA ADP |
Red Hat OpenShift Serverless redhat:serverless | 1 | CISA ADP |
Red Hat Red Hat build of Apache Camel 4 for Quarkus 3 redhat:camel_quarkus | 3 | CISA ADP |
Red Hat Red Hat build of Apicurio Registry 2 redhat:service_registry | 2 | CISA ADP |
Red Hat Red Hat build of Apicurio Registry 3 redhat:apicurio_registry | 3 | CISA ADP |
Red Hat Red Hat build of Debezium 3 redhat:debezium | 3 | CISA ADP |
Red Hat Red Hat Build of Keycloak redhat:build_keycloak | All versions | CISA ADP |
Red Hat Red Hat build of OptaPlanner 8 redhat:optaplanner | All versions | CISA ADP |
Red Hat Red Hat Data Grid 8 redhat:jboss_data_grid | 8 | CISA ADP |
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 redhat:enterprise_linux_ai | 3 | CISA ADP |
Red Hat Red Hat Fuse 7 redhat:jboss_fuse | 7 | CISA ADP |
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack redhat:jbosseapxp | All versions | CISA ADP |
Red Hat Red Hat Process Automation 7 redhat:jboss_enterprise_bpms_platform | 7 | CISA ADP |
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on | 7 | CISA ADP |
netty netty netty:netty | before 4.1.133; from 4.2.0 before 4.2.13 | NVD |
References
- https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fmx-refsource-confirm, exploit, mitigation, vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:23808
- https://access.redhat.com/errata/RHSA-2026:24502
- https://access.redhat.com/errata/RHSA-2026:25123
- https://access.redhat.com/errata/RHSA-2026:28010
- https://access.redhat.com/errata/RHSA-2026:36820
- https://access.redhat.com/errata/RHSA-2026:37390
- https://access.redhat.com/errata/RHSA-2026:49700
- https://access.redhat.com/errata/RHSA-2026:49701
- https://access.redhat.com/errata/RHSA-2026:53644
- https://access.redhat.com/errata/RHSA-2026:53645
- https://access.redhat.com/errata/RHSA-2026:53646
- https://access.redhat.com/errata/RHSA-2026:54435
- https://access.redhat.com/errata/RHSA-2026:65126
- https://access.redhat.com/security/cve/CVE-2026-42579
- https://bugzilla.redhat.com/show_bug.cgi?id=2477217
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42579.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.