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.
References
- www.cve.org/CVERecord ↗
- nvd.nist.gov/vuln/detail/CVE-2026-42579 ↗
- github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm ↗
- access.redhat.com/errata/RHSA-2026:23808 ↗
- access.redhat.com/errata/RHSA-2026:24502 ↗
- access.redhat.com/errata/RHSA-2026:25123 ↗
- access.redhat.com/errata/RHSA-2026:28010 ↗
- access.redhat.com/errata/RHSA-2026:36820 ↗
- access.redhat.com/errata/RHSA-2026:37390 ↗
- access.redhat.com/errata/RHSA-2026:49700 ↗
- access.redhat.com/errata/RHSA-2026:49701 ↗
- access.redhat.com/errata/RHSA-2026:53644 ↗
- access.redhat.com/errata/RHSA-2026:53645 ↗
- access.redhat.com/errata/RHSA-2026:53646 ↗
- access.redhat.com/errata/RHSA-2026:54435 ↗
- access.redhat.com/errata/RHSA-2026:65126 ↗
- access.redhat.com/security/cve/CVE-2026-42579 ↗
- bugzilla.redhat.com/show_bug.cgi ↗
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42579.json ↗
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This product uses the NVD API but is not endorsed or certified by the NVD. CVSS scores do not establish exploitation.