ubuntu-cve-2026-75595
Vulnerability from osv_ubuntu
Published
2026-08-21 00:00
Modified
2026-08-21 00:00
Summary
Details
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandler#decode checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause an IndexOutOfBoundsException and invoke select(ctx, null). This selects the default SslContext instead of the SNI-specific context. In deployments where per-SNI clientAuth=REQUIRE is the sole mutual TLS gate, the default SslContext uses clientAuth=NONE or clientAuth=OPTIONAL, and no application-layer certificate verification exists, an unauthenticated remote attacker can bypass the protected route's mutual TLS requirement. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:3.2.6.Final-2+deb8u2ubuntu0.1~esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.0.34-1ubuntu0.1~esm5"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:4.0.34-1ubuntu0.1~esm5?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:3.2.6.Final-2",
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.7-4ubuntu0.1+esm7"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:4.1.7-4ubuntu0.1+esm7?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:4.1.7-4",
"1:4.1.7-4ubuntu0.1~esm1",
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.45-1ubuntu0.1~esm7"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:4.1.45-1ubuntu0.1~esm7?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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",
"1:4.1.45-1ubuntu0.1~esm6",
"1:4.1.45-1ubuntu0.1~esm7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-4+deb11u2ubuntu0.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:4.1.48-4+deb11u2ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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~esm1",
"1:4.1.48-4+deb11u2ubuntu0.1~esm2",
"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+deb11u2ubuntu0.2",
"1:4.1.48-4+deb11u2ubuntu0.2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetty-java",
"binary_version": "1:4.1.48-9ubuntu0.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:4.1.48-9ubuntu0.2+esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:4.1.48-7",
"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"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:26.04:LTS",
"name": "netty",
"purl": "pkg:deb/ubuntu/netty@1:4.1.48-16ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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"
]
}
],
"aliases": [],
"details": "Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandler#decode checks the wrong offset before reading the four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause an IndexOutOfBoundsException and invoke select(ctx, null). This selects the default SslContext instead of the SNI-specific context. In deployments where per-SNI clientAuth=REQUIRE is the sole mutual TLS gate, the default SslContext uses clientAuth=NONE or clientAuth=OPTIONAL, and no application-layer certificate verification exists, an unauthenticated remote attacker can bypass the protected route\u0027s mutual TLS requirement. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.",
"id": "UBUNTU-CVE-2026-75595",
"modified": "2026-08-21T00:00:00Z",
"published": "2026-08-21T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-75595"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-75595"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/security/advisories/GHSA-fccg-mwvh-qqg4"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/pull/17213"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/pull/17217"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/commit/9e0519239108a69b7e9bbc5e9182ee139a0d7961"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/releases/tag/netty-4.1.137.Final"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/releases/tag/netty-4.2.17.Final"
},
{
"type": "REPORT",
"url": "https://github.com/netty/netty/security/advisories/GHSA-c4c3-7fpv-j4q5"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-75595"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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