Critical
netty — security advisory
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
- Products
- netty
- Affected versions
- 1:4.1.48-10, 1:4.1.48-10+deb13u1, 1:4.1.48-11, 1:4.1.48-12, 1:4.1.48-13, 1:4.1.48-14, 1:4.1.48-15, 1:4.1.48-16, 1:4.1.48-7, 1:4.1.48-7+deb12u1, 1:4.1.48-7+deb12u2, 1:4.1.48-8, 1:4.1.48-9
- Fixed versions
- Not specified
- CVEs
- CVE-2026-42584
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:37 UTC · Revision 2
Source evidence
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
osv:DEBIAN-CVE-2026-42584
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
Complete source record
{
"id": "12119e03e8c0ed8a450050358927393bd6a275a4dad651aa619c8e97f77d7d6d",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-42584",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-42584",
"summary": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.",
"evidence": "osv:DEBIAN-CVE-2026-42584",
"products": [
{
"name": {
"value": "netty",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-11",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-12",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-13",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-14",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-15",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-16",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-7",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-7+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-7+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-8",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-9",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-10+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-11",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-12",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-13",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-14",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-15",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.1.48-16",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-12",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-13",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-14",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-15",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-16",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-42584",
"aliases": [
"DEBIAN-CVE-2026-42584"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-15",
"1:4.1.48-16",
"1:4.1.48-7",
"1:4.1.48-7+deb12u1",
"1:4.1.48-7+deb12u2",
"1:4.1.48-8",
"1:4.1.48-9"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42584.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-10+deb13u1",
"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-15",
"1:4.1.48-16"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42584.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-11",
"1:4.1.48-12",
"1:4.1.48-13",
"1:4.1.48-14",
"1:4.1.48-15",
"1:4.1.48-16"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42584.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:31.291224720Z",
"provider": "osv",
"upstream": [
"CVE-2026-42584"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-42584"
]
},
"related_cves": [
{
"value": "CVE-2026-42584",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460921,
"published_at": "2026-05-13T19:17:24.043+00:00"
}