{
"id": "GHSA-3qp7-7mw8-wx86",
"aliases": [
"CVE-2026-44249"
],
"details": "### Summary\nAn attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions.\n\n### Details\n`io.netty.handler.ipfilter.IpSubnetFilterRule#compareTo(java.net.InetSocketAddress)` method performs a bitwise AND between the incoming IP address and the configured networkAddress, instead of the subnetMask.\n\n### Impact\nAccess Control Bypass. Attacker can bypass IpSubnetFilter IPv6 access controls.",
"summary": "Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.2.0.Final"
},
{
"fixed": "4.2.15.Final"
}
]
}
],
"package": {
"name": "io.netty:netty-handler",
"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-handler",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 4.1.134.Final"
}
}
],
"modified": "2026-06-12T19:27:07Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"published": "2026-06-08T19:00:33Z",
"references": [
{
"url": "https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44249",
"type": "ADVISORY"
},
{
"url": "https://github.com/netty/netty",
"type": "PACKAGE"
},
{
"url": "https://github.com/netty/netty/releases/tag/netty-4.1.135.Final",
"type": "WEB"
},
{
"url": "https://github.com/netty/netty/releases/tag/netty-4.2.15.Final",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-284",
"CWE-697"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-06-11T22:16:56Z",
"github_reviewed_at": "2026-06-08T19:00:33Z"
}
}