Medium
netty — security advisory
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject \r\n sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The 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-2026-59919
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:49 UTC · Revision 1
Source evidence
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject \r\n sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
osv:UBUNTU-CVE-2026-59919
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": "dfb2c86baa0b77b0476cf889a53932397226177ca9463dcff725050a721ab664",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-59919",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-59919",
"summary": "Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject \\r\\n sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The issue is fixed in versions 4.1.136.Final and 4.2.16.Final.",
"evidence": "osv:UBUNTU-CVE-2026-59919",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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{
"value": "1:3.2.6.Final-2",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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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"
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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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{
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
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"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"
},
{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
}
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},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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{
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"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",
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{
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},
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{
"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",
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{
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{
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},
{
"value": "1:4.1.48-16ubuntu1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
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},
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{
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"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",
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-59919",
"aliases": [
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],
"metrics": [
{
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"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
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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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},
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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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"1:4.1.33-2",
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],
"database_specific": {
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},
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],
"package": {
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},
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"1:4.1.48-4+deb11u2ubuntu0.1~esm2",
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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{
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],
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},
"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-2026-59919.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-9ubuntu0.2+esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"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-2026-59919.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-2026-59919.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": "2026-10-17T12:59:14.422123729Z",
"provider": "osv",
"upstream": [
"CVE-2026-59919"
],
"references": [
"https://ubuntu.com/security/CVE-2026-59919",
"https://www.cve.org/CVERecord?id=CVE-2026-59919",
"https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h"
]
},
"related_cves": [
{
"value": "CVE-2026-59919",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359524,
"published_at": "2026-07-29T18:16:00+00:00"
}