High
netty — security advisory
Netty is a network application framework for development of protocol servers and clients. Prior to 4.2.16.Final, Netty's `Http3FrameCodec` buffers incoming data for HTTP/3 reserved frame types up to the wire-specified payload length without limits; `decodeFrame` trusts `payLoadLength`, allowing an attacker to open multiple QUIC streams and send reserved frames with very large payload lengths to cause memory exhaustion and denial of service. This issue is fixed in version 4.2.16.Final.
- Products
- netty
- Affected versions
- 1:3.2.6.Final-2, 1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1, 1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1, 1:4.0.32-1, 1:4.0.33-1, 1:4.0.34-1, 1:4.0.34-1ubuntu0.1~esm1, 1:4.0.34-1ubuntu0.1~esm2, 1:4.0.34-1ubuntu0.1~esm3, 1:4.0.34-1ubuntu0.1~esm4, 1:4.0.34-1ubuntu0.1~esm5, 1:4.1.33-1, 1:4.1.33-2, 1:4.1.33-3, 1:4.1.45-1, 1:4.1.45-1ubuntu0.1~esm1, 1:4.1.45-1ubuntu0.1~esm2, 1:4.1.45-1ubuntu0.1~esm3, 1:4.1.45-1ubuntu0.1~esm4, 1:4.1.45-1ubuntu0.1~esm6, 1:4.1.45-1ubuntu0.1~esm7, 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, 1:4.1.48-16, 1:4.1.48-16ubuntu0.1~esm2, 1:4.1.48-16ubuntu1, 1:4.1.48-4, 1:4.1.48-4+deb11u1build0.22.04.1, 1:4.1.48-4+deb11u2build0.22.04.1, 1:4.1.48-4+deb11u2ubuntu0.1, 1:4.1.48-4+deb11u2ubuntu0.1+esm1, 1:4.1.48-4+deb11u2ubuntu0.1+esm3, 1:4.1.48-4+deb11u2ubuntu0.1~esm1, 1:4.1.48-4+deb11u2ubuntu0.1~esm2, 1:4.1.48-4+deb11u2ubuntu0.2, 1:4.1.48-4+deb11u2ubuntu0.2+esm1, 1:4.1.48-7, 1:4.1.48-8, 1:4.1.48-9, 1:4.1.48-9ubuntu0.1, 1:4.1.48-9ubuntu0.1+esm1, 1:4.1.48-9ubuntu0.1+esm3, 1:4.1.48-9ubuntu0.1~esm1, 1:4.1.48-9ubuntu0.1~esm2, 1:4.1.48-9ubuntu0.2, 1:4.1.48-9ubuntu0.2+esm1, 1:4.1.48-9ubuntu0.2+esm2, 1:4.1.7-4, 1:4.1.7-4ubuntu0.1, 1:4.1.7-4ubuntu0.1+esm1, 1:4.1.7-4ubuntu0.1+esm2, 1:4.1.7-4ubuntu0.1+esm3, 1:4.1.7-4ubuntu0.1+esm4, 1:4.1.7-4ubuntu0.1+esm5, 1:4.1.7-4ubuntu0.1+esm6, 1:4.1.7-4ubuntu0.1+esm7, 1:4.1.7-4ubuntu0.1~esm1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-56816
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:47 UTC · Revision 1
Source evidence
Netty is a network application framework for development of protocol servers and clients. Prior to 4.2.16.Final, Netty's `Http3FrameCodec` buffers incoming data for HTTP/3 reserved frame types up to the wire-specified payload length without limits; `decodeFrame` trusts `payLoadLength`, allowing an attacker to open multiple QUIC streams and send reserved frames with very large payload lengths to cause memory exhaustion and denial of service. This issue is fixed in version 4.2.16.Final.
osv:UBUNTU-CVE-2026-56816
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
Complete source record
{
"id": "0159700811785981228d5b8fd775112ebbd380ba37577b110fc0e871772904a4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-56816",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-56816",
"summary": "Netty is a network application framework for development of protocol servers and clients. Prior to 4.2.16.Final, Netty's `Http3FrameCodec` buffers incoming data for HTTP/3 reserved frame types up to the wire-specified payload length without limits; `decodeFrame` trusts `payLoadLength`, allowing an attacker to open multiple QUIC streams and send reserved frames with very large payload lengths to cause memory exhaustion and denial of service. This issue is fixed in version 4.2.16.Final.",
"evidence": "osv:UBUNTU-CVE-2026-56816",
"products": [
{
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"value": "netty",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "1:3.2.6.Final-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:3.2.6.Final-2+deb8u2build0.14.04.1~esm1",
"evidence": "/affected/0/versions"
},
{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
},
{
"value": "1:4.0.34-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.0.34-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.0.34-1ubuntu0.1~esm2",
"evidence": "/affected/1/versions"
},
{
"value": "1:4.0.34-1ubuntu0.1~esm3",
"evidence": "/affected/1/versions"
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{
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{
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{
"value": "1:4.1.7-4ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.7-4ubuntu0.1+esm1",
"evidence": "/affected/2/versions"
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{
"value": "1:4.1.7-4ubuntu0.1+esm2",
"evidence": "/affected/2/versions"
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{
"value": "1:4.1.7-4ubuntu0.1+esm3",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.7-4ubuntu0.1+esm4",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.7-4ubuntu0.1+esm5",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.7-4ubuntu0.1+esm6",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.7-4ubuntu0.1+esm7",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:4.1.33-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.33-2",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.33-3",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm2",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm3",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm4",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm6",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.45-1ubuntu0.1~esm7",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:4.1.48-4",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u1build0.22.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2build0.22.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1~esm1",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1~esm2",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1+esm1",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1+esm3",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.2",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.2+esm1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1:4.1.48-7",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-8",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1~esm1",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1~esm2",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1+esm1",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1+esm3",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.2",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.2+esm1",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-9ubuntu0.2+esm2",
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}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:4.1.48-16",
"evidence": "/affected/6/versions"
},
{
"value": "1:4.1.48-16ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/7/versions"
},
{
"value": "1:4.1.48-11",
"evidence": "/affected/7/versions"
},
{
"value": "1:4.1.48-12",
"evidence": "/affected/7/versions"
},
{
"value": "1:4.1.48-13",
"evidence": "/affected/7/versions"
},
{
"value": "1:4.1.48-14",
"evidence": "/affected/7/versions"
},
{
"value": "1:4.1.48-16",
"evidence": "/affected/7/versions"
},
{
"value": "1:4.1.48-16ubuntu0.1~esm2",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-56816",
"aliases": [
"UBUNTU-CVE-2026-56816"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
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},
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"1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1"
],
"database_specific": {
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},
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{
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}
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}
},
{
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"package": {
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},
"versions": [
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"1:4.0.32-1",
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"1:4.0.34-1ubuntu0.1~esm2",
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"1:4.0.34-1ubuntu0.1~esm5"
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},
"ecosystem_specific": {
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}
},
{
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"package": {
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},
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],
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},
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}
},
{
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],
"package": {
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},
"versions": [
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"1:4.1.45-1ubuntu0.1~esm2",
"1:4.1.45-1ubuntu0.1~esm3",
"1:4.1.45-1ubuntu0.1~esm4",
"1:4.1.45-1ubuntu0.1~esm6",
"1:4.1.45-1ubuntu0.1~esm7"
],
"database_specific": {
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},
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},
{
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],
"package": {
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},
"versions": [
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"1:4.1.48-4+deb11u2ubuntu0.1~esm1",
"1:4.1.48-4+deb11u2ubuntu0.1~esm2",
"1:4.1.48-4+deb11u2ubuntu0.1",
"1:4.1.48-4+deb11u2ubuntu0.1+esm1",
"1:4.1.48-4+deb11u2ubuntu0.1+esm3",
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],
"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
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],
"package": {
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"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
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"1:4.1.48-8",
"1:4.1.48-9",
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"1:4.1.48-9ubuntu0.1~esm2",
"1:4.1.48-9ubuntu0.1",
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"1:4.1.48-9ubuntu0.1+esm3",
"1:4.1.48-9ubuntu0.2",
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"1:4.1.48-9ubuntu0.2+esm2"
],
"database_specific": {
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},
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{
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}
]
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/ubuntu/netty?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1:4.1.48-16",
"1:4.1.48-16ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56816.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-buffer-java",
"binary_version": "1:4.1.48-16ubuntu1"
},
{
"binary_name": "libnetty-common-java",
"binary_version": "1:4.1.48-16ubuntu1"
},
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-16ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/ubuntu/netty?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"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",
"1:4.1.48-16",
"1:4.1.48-16ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56816.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-buffer-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
},
{
"binary_name": "libnetty-common-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
},
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-16ubuntu0.1~esm2"
}
]
}
}
],
"modified": "2026-10-17T12:59:11.196581339Z",
"provider": "osv",
"upstream": [
"CVE-2026-56816"
],
"references": [
"https://ubuntu.com/security/CVE-2026-56816",
"https://www.cve.org/CVERecord?id=CVE-2026-56816",
"https://github.com/netty/netty/security/advisories/GHSA-hpcc-26xq-25fv"
]
},
"related_cves": [
{
"value": "CVE-2026-56816",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359400,
"published_at": "2026-07-21T22:17:00+00:00"
}