{
"id": "GHSA-676x-f7gg-47vc",
"aliases": [
"CVE-2026-45674"
],
"details": "### Summary\nNetty's DnsResolveContext fails to validate the origin (bailiwick) of CNAME records in DNS responses.\n\n### Details\nIn `io.netty.resolver.dns.DnsResolveContext#buildAliasMap`, the resolver processes the ANSWER section of a DNS response and blindly caches all CNAME records it finds.\n\nAccording to https://datatracker.ietf.org/doc/html/rfc5452#section-6 \n\n```\nCare must be taken to only accept\n data if it is known that the originator is authoritative for the\n QNAME or a parent of the QNAME.\n One very simple way to achieve this is to only accept data if it is\n part of the domain for which the query was intended.\n```\n\n### Impact\nDNS Cache Poisoning (Bailiwick Bypass). Any application using Netty's DNS resolver is impacted.",
"summary": "Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.2.0.Final"
},
{
"fixed": "4.2.15.Final"
}
]
}
],
"package": {
"name": "io.netty:netty-resolver-dns",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 4.2.14.Final"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.135.Final"
}
]
}
],
"package": {
"name": "io.netty:netty-resolver-dns",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 4.1.134.Final"
}
}
],
"modified": "2026-09-02T15:34:14Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N"
}
],
"published": "2026-06-08T23:02:26Z",
"references": [
{
"url": "https://github.com/netty/netty/security/advisories/GHSA-676x-f7gg-47vc",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45674",
"type": "ADVISORY"
},
{
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45674.json",
"type": "WEB"
},
{
"url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final",
"type": "WEB"
},
{
"url": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final",
"type": "WEB"
},
{
"url": "https://github.com/netty/netty",
"type": "PACKAGE"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2488400",
"type": "WEB"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-45674",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:62260",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:54435",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:53806",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:53644",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:50085",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:49701",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:49700",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:48151",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:41951",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:37390",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:34608",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:26586",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:26018",
"type": "WEB"
},
{
"url": "https://access.redhat.com/errata/RHSA-2026:26017",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-345",
"CWE-346"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-06-12T15:16:27Z",
"github_reviewed_at": "2026-06-08T23:02:26Z"
}
}