HighFix available
netty — security advisory
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
- Products
- netty
- Affected versions
- 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, 1:4.1.48-10, 1:4.1.48-10ubuntu0.25.10.1, 1:4.1.48-10ubuntu0.25.10.2, 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, 1:4.1.48-16ubuntu1, 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~esm1, 1:4.1.48-4+deb11u2ubuntu0.1~esm2, 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~esm1, 1:4.1.48-9ubuntu0.1~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~esm1
- Fixed versions
- 1:4.1.45-1ubuntu0.1~esm6, 1:4.1.48-16ubuntu0.1~esm2, 1:4.1.48-4+deb11u2ubuntu0.1+esm3, 1:4.1.48-9ubuntu0.1+esm3, 1:4.1.7-4ubuntu0.1+esm6
- CVEs
- CVE-2026-42578
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:03 UTC · Revision 1
Source evidence
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
osv:UBUNTU-CVE-2026-42578
netty
Fixed versions: 1:4.1.7-4ubuntu0.1+esm6
netty
Fixed versions: 1:4.1.45-1ubuntu0.1~esm6
netty
Fixed versions: 1:4.1.48-4+deb11u2ubuntu0.1+esm3
netty
Fixed versions: 1:4.1.48-9ubuntu0.1+esm3
netty
Fixed versions: Not specified
netty
Fixed versions: Not specified
netty
Fixed versions: 1:4.1.48-16ubuntu0.1~esm2
Complete source record
{
"id": "51c7fd56ddbdbf9fa1e5f66f12c56284bb46f7004952681064e40467d3cf4865",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-42578",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-42578",
"summary": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.",
"evidence": "osv:UBUNTU-CVE-2026-42578",
"products": [
{
"name": {
"value": "netty",
"evidence": "/affected/0/package/name"
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{
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{
"value": "1:4.1.7-4",
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{
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{
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{
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{
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{
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{
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{
"value": "1:4.1.45-1",
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{
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"name": {
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{
"value": "1:4.1.48-4",
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{
"value": "1:4.1.48-4+deb11u1build0.22.04.1",
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{
"value": "1:4.1.48-4+deb11u2build0.22.04.1",
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{
"value": "1:4.1.48-4+deb11u2ubuntu0.1~esm1",
"evidence": "/affected/2/versions"
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{
"value": "1:4.1.48-4+deb11u2ubuntu0.1~esm2",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1+esm1",
"evidence": "/affected/2/versions"
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]
},
{
"name": {
"value": "netty",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:4.1.48-9ubuntu0.1+esm3",
"evidence": "/affected/3/ranges"
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],
"affected_versions": [
{
"value": "1:4.1.48-7",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.48-8",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.48-9",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1~esm2",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1",
"evidence": "/affected/3/versions"
},
{
"value": "1:4.1.48-9ubuntu0.1+esm1",
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},
{
"name": {
"value": "netty",
"evidence": "/affected/4/package/name"
},
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"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/4/versions"
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{
"value": "1:4.1.48-10ubuntu0.25.10.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:4.1.48-10ubuntu0.25.10.2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "1:4.1.48-16",
"evidence": "/affected/5/versions"
},
{
"value": "1:4.1.48-16ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:4.1.48-16ubuntu0.1~esm2",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/6/versions"
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{
"value": "1:4.1.48-11",
"evidence": "/affected/6/versions"
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{
"value": "1:4.1.48-12",
"evidence": "/affected/6/versions"
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{
"value": "1:4.1.48-13",
"evidence": "/affected/6/versions"
},
{
"value": "1:4.1.48-14",
"evidence": "/affected/6/versions"
},
{
"value": "1:4.1.48-16",
"evidence": "/affected/6/versions"
}
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}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-42578",
"aliases": [
"UBUNTU-CVE-2026-42578"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P"
},
{
"type": "CVSS_V3",
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},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
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{
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{
"type": "ECOSYSTEM",
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{
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}
]
}
],
"package": {
"name": "netty",
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1:4.1.7-4",
"1:4.1.7-4ubuntu0.1~esm1",
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"1:4.1.7-4ubuntu0.1+esm1",
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"1:4.1.7-4ubuntu0.1+esm4",
"1:4.1.7-4ubuntu0.1+esm5"
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"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42578.json"
},
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{
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],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
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}
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"package": {
"name": "netty",
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"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42578.json"
},
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{
"binary_name": "libnetty-java",
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}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/ubuntu/netty?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
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"1:4.1.48-4+deb11u2ubuntu0.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42578.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-4+deb11u2ubuntu0.1+esm3"
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],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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{
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],
"package": {
"name": "netty",
"purl": "pkg:deb/ubuntu/netty?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"1:4.1.48-7",
"1:4.1.48-8",
"1:4.1.48-9",
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"1:4.1.48-9ubuntu0.1",
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"database_specific": {
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},
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{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-9ubuntu0.1+esm3"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
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{
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]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/ubuntu/netty?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"1:4.1.48-10",
"1:4.1.48-10ubuntu0.25.10.1",
"1:4.1.48-10ubuntu0.25.10.2"
],
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42578.json"
},
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"binaries": [
{
"binary_name": "libnetty-java",
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]
}
},
{
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{
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{
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}
],
"package": {
"name": "netty",
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},
"versions": [
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"1:4.1.48-16ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42578.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",
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}
},
{
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{
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{
"introduced": "0"
},
{
"fixed": "1:4.1.48-16ubuntu0.1~esm2"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42578.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"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
}
],
"modified": "2026-10-17T13:00:05.142429010Z",
"provider": "osv",
"upstream": [
"CVE-2026-42578"
],
"references": [
"https://ubuntu.com/security/CVE-2026-42578",
"https://www.cve.org/CVERecord?id=CVE-2026-42578",
"https://github.com/netty/netty/security/advisories/GHSA-45q3-82m4-75jr",
"https://ubuntu.com/security/notices/USN-8401-1"
]
},
"related_cves": [
{
"value": "CVE-2026-42578",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360287,
"published_at": "2026-05-13T19:17:00+00:00"
}