High
netty — security advisory
Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the `SpdyHttpDecoder` handler in Netty's SPDY-to-HTTP codec allocates a pooled `ByteBuf` when processing a client-initiated `SYN_STREAM` frame with `FLAG_FIN=0` and stores the partially constructed `FullHttpRequest` in `messageMap`; when the remote peer sends `RST_STREAM` for that stream or the accumulated content exceeds `maxContentLength`, the decoder removes the entry but does not release the pooled `ByteBuf`, causing native memory exhaustion. This issue is fixed in versions 4.1.136.Final and 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-2026-56745
- 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. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the `SpdyHttpDecoder` handler in Netty's SPDY-to-HTTP codec allocates a pooled `ByteBuf` when processing a client-initiated `SYN_STREAM` frame with `FLAG_FIN=0` and stores the partially constructed `FullHttpRequest` in `messageMap`; when the remote peer sends `RST_STREAM` for that stream or the accumulated content exceeds `maxContentLength`, the decoder removes the entry but does not release the pooled `ByteBuf`, causing native memory exhaustion. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
osv:UBUNTU-CVE-2026-56745
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": "a48747916c55cb2e096585fb8aa1a66f3da4575916a947ad9781ecd0e5ba9c55",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-56745",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-56745",
"summary": "Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, the `SpdyHttpDecoder` handler in Netty's SPDY-to-HTTP codec allocates a pooled `ByteBuf` when processing a client-initiated `SYN_STREAM` frame with `FLAG_FIN=0` and stores the partially constructed `FullHttpRequest` in `messageMap`; when the remote peer sends `RST_STREAM` for that stream or the accumulated content exceeds `maxContentLength`, the decoder removes the entry but does not release the pooled `ByteBuf`, causing native memory exhaustion. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.",
"evidence": "osv:UBUNTU-CVE-2026-56745",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "1:3.2.6.Final-2",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
}
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{
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"affected_versions": [
{
"value": "1:3.2.6.Final-2",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
"value": "1:4.0.34-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
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{
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{
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"evidence": "/affected/2/versions"
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{
"value": "1:4.1.7-4ubuntu0.1",
"evidence": "/affected/2/versions"
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{
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"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"
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{
"value": "1:4.1.7-4ubuntu0.1+esm4",
"evidence": "/affected/2/versions"
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{
"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"
},
{
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}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"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"
}
]
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{
"name": {
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"evidence": "/affected/5/package/name"
},
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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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{
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},
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{
"value": "1:4.1.48-16",
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},
{
"value": "1:4.1.48-16ubuntu1",
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}
]
},
{
"name": {
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"evidence": "/affected/7/package/name"
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"prerequisites": [],
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"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/7/versions"
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{
"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"
},
{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-56745",
"aliases": [
"UBUNTU-CVE-2026-56745"
],
"metrics": [
{
"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"
},
{
"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"
}
],
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"events": [
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}
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"1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1"
],
"database_specific": {
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},
"ecosystem_specific": {
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]
}
},
{
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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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],
"package": {
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},
"versions": [
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"1:4.1.45-1ubuntu0.1~esm7"
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},
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},
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],
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],
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},
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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",
"1:4.1.48-9ubuntu0.1~esm1",
"1:4.1.48-9ubuntu0.1~esm2",
"1:4.1.48-9ubuntu0.1",
"1:4.1.48-9ubuntu0.1+esm1",
"1:4.1.48-9ubuntu0.1+esm3",
"1:4.1.48-9ubuntu0.2",
"1:4.1.48-9ubuntu0.2+esm1",
"1:4.1.48-9ubuntu0.2+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56745.json"
},
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"binaries": [
{
"binary_name": "libnetty-java",
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}
]
}
},
{
"ranges": [
{
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"events": [
{
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}
]
}
],
"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-2026-56745.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": [
{
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{
"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-2026-56745.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": "2026-10-17T12:59:10.623101325Z",
"provider": "osv",
"upstream": [
"CVE-2026-56745"
],
"references": [
"https://ubuntu.com/security/CVE-2026-56745",
"https://www.cve.org/CVERecord?id=CVE-2026-56745",
"https://github.com/netty/netty/security/advisories/GHSA-jppx-w49h-x2qq"
]
},
"related_cves": [
{
"value": "CVE-2026-56745",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359387,
"published_at": "2026-07-21T22:17:00+00:00"
}