{
"id": "GHSA-h2qv-fj59-j46j",
"aliases": [
"CVE-2026-48059"
],
"details": "### Impact\nThe HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested `PP2_TYPE_SSL` TLVs (type-length-value records) at depth two or greater. The leak occurs on the successful parse path — no exception is thrown, the message fires downstream, the decoder removes itself, and the application releases the `HAProxyMessage` normally. Yet the underlying cumulation buffer (a pooled, potentially direct `ByteBuf` allocated by the channel) remains permanently pinned.",
"summary": "Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memory Exhaustion",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.2.0.Final"
},
{
"fixed": "4.2.15.Final"
}
]
}
],
"package": {
"name": "io.netty:netty-codec-haproxy",
"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-codec-haproxy",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 4.1.134.Final"
}
}
],
"modified": "2026-08-13T15:34:09Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"published": "2026-06-11T20:19:27Z",
"references": [
{
"url": "https://github.com/netty/netty/security/advisories/GHSA-h2qv-fj59-j46j",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48059",
"type": "ADVISORY"
},
{
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48059.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=2488437",
"type": "WEB"
},
{
"url": "https://access.redhat.com/security/cve/CVE-2026-48059",
"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-2026:48151",
"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-2026:36820",
"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-1286",
"CWE-401"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-06-12T16:16:30Z",
"github_reviewed_at": "2026-06-11T20:19:27Z"
}
}