# CVE-2026-42579: Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)

> CVE-2026-42579: Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder). CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-42579
Last updated: 2026-09-18T13:18:19Z

- Published: 2026-05-13 18:01 UTC · Updated: 2026-09-18 13:18 UTC · Assigner: GitHub\_M
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS: 1.0%, 63th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-20, CWE-400, CWE-626

## 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.

## Affected vendors and products

- netty: netty
- Red Hat: Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16
- Red Hat: Red Hat build of Apache Camel 4 for Quarkus 3
- Red Hat: Red Hat build of Apicurio Registry 3
- Red Hat: Red Hat build of Debezium 3
- Red Hat: Red Hat Build of Keycloak
- Red Hat: Red Hat Data Grid 8
- Red Hat: Red Hat Enterprise Linux AI (RHEL AI) 3
- Red Hat: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
- Red Hat: Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1.7.GA
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
- Red Hat: Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 9
- Red Hat: streams for Apache Kafka 2
- Red Hat: Streams for Apache Kafka 3.2.1

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-42579)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-42579)
- [https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm](https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-42579 · Markdown: https://rewindex.com/cve/CVE-2026-42579.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-42579 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T01:58:51.944Z