{"id":"CVE-2026-42579","aliases":["GHSA-cm33-6792-r9fm"],"url":"https://o3.security/vulnerability/CVE-2026-42579","summary":"Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)","details":"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.","published":"2026-05-13T18:01:52.500Z","modified":"2026-08-07T11:31:02.056768425Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"io.netty:netty-codec-dns","fixedVersion":"4.2.13.Final"},{"ecosystem":"Maven","name":"io.netty:netty-codec-dns","fixedVersion":"4.1.133.Final"}],"fix":null,"references":[{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42579.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23808"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24502"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25123"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28010"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36820"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37390"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42579"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42579.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-cm33-6792-r9fm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42579"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477217"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:02.056768425Z"}}