Medium
netty — security advisory
Netty is a network application framework for development of protocol servers and clients. Versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, are vulnerable to security control bypass during the origin evaluation process. CorsHandler provides a shortCircuit() configuration designed to reject unauthorized cross-origin requests immediately, acting as a security control before requests reach the application. However, due to a logical operator error in the origin evaluation process, this protection can be entirely bypassed. An attacker can bypass the short-circuit mechanism by sending a request with an Origin: null header. This failure forwards unauthorized requests to the backend application, bypassing intended access controls. 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-2026-56746
- 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. Versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, are vulnerable to security control bypass during the origin evaluation process. CorsHandler provides a shortCircuit() configuration designed to reject unauthorized cross-origin requests immediately, acting as a security control before requests reach the application. However, due to a logical operator error in the origin evaluation process, this protection can be entirely bypassed. An attacker can bypass the short-circuit mechanism by sending a request with an Origin: null header. This failure forwards unauthorized requests to the backend application, bypassing intended access controls. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
osv:UBUNTU-CVE-2026-56746
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": "da52b6542b5bf3a73d887613063c0c79bdd7283eb56c5b87dd62babcbbf14ff4",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-56746",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-56746",
"summary": "Netty is a network application framework for development of protocol servers and clients. Versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, are vulnerable to security control bypass during the origin evaluation process. CorsHandler provides a shortCircuit() configuration designed to reject unauthorized cross-origin requests immediately, acting as a security control before requests reach the application. However, due to a logical operator error in the origin evaluation process, this protection can be entirely bypassed. An attacker can bypass the short-circuit mechanism by sending a request with an Origin: null header. This failure forwards unauthorized requests to the backend application, bypassing intended access controls. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.",
"evidence": "osv:UBUNTU-CVE-2026-56746",
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{
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{
"name": {
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"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"
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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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{
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{
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},
{
"value": "1:4.1.48-4+deb11u2ubuntu0.1+esm3",
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{
"value": "1:4.1.48-4+deb11u2ubuntu0.2",
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{
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{
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{
"value": "1:4.1.48-8",
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{
"value": "1:4.1.48-9",
"evidence": "/affected/5/versions"
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{
"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"
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{
"value": "1:4.1.48-9ubuntu0.1+esm1",
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{
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{
"value": "1:4.1.48-11",
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{
"value": "1:4.1.48-12",
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},
{
"value": "1:4.1.48-13",
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},
{
"value": "1:4.1.48-14",
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{
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"severity": "medium",
"structured": {
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"aliases": [
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],
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},
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},
"versions": [
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},
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"1:4.1.48-9ubuntu0.1+esm3",
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],
"database_specific": {
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},
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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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"purl": "pkg:deb/ubuntu/netty?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1:4.1.48-16",
"1:4.1.48-16ubuntu1"
],
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},
"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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{
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}
]
}
],
"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-2026-56746.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": "2026-10-17T12:59:11.131040613Z",
"provider": "osv",
"upstream": [
"CVE-2026-56746"
],
"references": [
"https://ubuntu.com/security/CVE-2026-56746",
"https://www.cve.org/CVERecord?id=CVE-2026-56746",
"https://github.com/netty/netty/security/advisories/GHSA-6cqp-g7gg-8hr5"
]
},
"related_cves": [
{
"value": "CVE-2026-56746",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359397,
"published_at": "2026-07-21T22:17:00+00:00"
}