netty — security advisory
Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.
- Products
- netty
- Affected versions
- 1:4.1.48-10, 1:4.1.48-11, 1:4.1.48-12, 1:4.1.48-7, 1:4.1.48-7+deb12u1
- Fixed versions
- 1:4.1.48-10+deb13u1, 1:4.1.48-13, 1:4.1.48-7+deb12u2
- CVEs
- CVE-2025-58056
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 22:33 UTC · Revision 1
Source evidence
Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.
osv:DEBIAN-CVE-2025-58056
netty
Fixed versions: 1:4.1.48-7+deb12u2
netty
Fixed versions: 1:4.1.48-10+deb13u1
netty
Fixed versions: 1:4.1.48-13
Complete source record
{
"id": "bb7d108a4bebd5c30dd15d1008ac74b525da61f48ce1d70766b2473ef18133b6",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-58056",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2025-58056",
"summary": "Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.",
"evidence": "osv:DEBIAN-CVE-2025-58056",
"products": [
{
"name": {
"value": "netty",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:4.1.48-7+deb12u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:4.1.48-7",
"evidence": "/affected/0/versions"
},
{
"value": "1:4.1.48-7+deb12u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:4.1.48-10+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "netty",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:4.1.48-13",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:4.1.48-10",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-11",
"evidence": "/affected/2/versions"
},
{
"value": "1:4.1.48-12",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2025-58056",
"aliases": [
"DEBIAN-CVE-2025-58056"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:4.1.48-7+deb12u2"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:4.1.48-7",
"1:4.1.48-7+deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-58056.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:4.1.48-10+deb13u1"
}
]
}
],
"package": {
"name": "netty",
"purl": "pkg:deb/debian/netty?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:4.1.48-10"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-58056.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:4.1.48-13"
}
]
}
],
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-58056.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-23T17:47:23.863454401Z",
"provider": "osv",
"upstream": [
"CVE-2025-58056"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2025-58056"
]
},
"related_cves": [
{
"value": "CVE-2025-58056",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 416700,
"published_at": "2025-09-03T21:15:33.07+00:00"
}