{
"id": "GHSA-4mp9-239f-g9hg",
"aliases": [
"CVE-2026-59898"
],
"details": "## Summary\nAn attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending `Sec-WebSocket-Version: 7` and omitting `Connection: Upgrade` / `Upgrade: websocket` headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks.",
"summary": "Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "4.2.0.Final"
},
{
"fixed": "4.2.16.Final"
}
]
}
],
"package": {
"name": "io.netty:netty-codec-http",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 4.2.15.Final"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.136.Final"
}
]
}
],
"package": {
"name": "io.netty:netty-codec-http",
"ecosystem": "Maven"
}
}
],
"modified": "2026-07-22T21:48:59Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
}
],
"published": "2026-07-22T21:48:59Z",
"references": [
{
"url": "https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg",
"type": "WEB"
},
{
"url": "https://github.com/netty/netty",
"type": "PACKAGE"
},
{
"url": "https://github.com/netty/netty/releases/tag/netty-4.1.136.Final",
"type": "WEB"
},
{
"url": "https://github.com/netty/netty/releases/tag/netty-4.2.16.Final",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-444"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-07-22T21:48:59Z"
}
}