ubuntu-cve-2026-42011
Vulnerability from osv_ubuntu
Published
2026-05-07 15:16
Modified
2026-07-06 14:11
Summary
Details
A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.
Severity
7.4 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.5.18-1ubuntu1.6+esm3"
},
{
"binary_name": "libgnutls-dane0",
"binary_version": "3.5.18-1ubuntu1.6+esm3"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.5.18-1ubuntu1.6+esm3"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.5.18-1ubuntu1.6+esm3"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.5.18-1ubuntu1.6+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.5.18-1ubuntu1.6+esm3?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.5.8-6ubuntu3",
"3.5.17-1ubuntu1",
"3.5.17-1ubuntu3",
"3.5.18-1ubuntu1",
"3.5.18-1ubuntu1.1",
"3.5.18-1ubuntu1.2",
"3.5.18-1ubuntu1.3",
"3.5.18-1ubuntu1.4",
"3.5.18-1ubuntu1.5",
"3.5.18-1ubuntu1.6",
"3.5.18-1ubuntu1.6+esm1",
"3.5.18-1ubuntu1.6+esm2",
"3.5.18-1ubuntu1.6+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.6.13-2ubuntu1.12+esm2"
},
{
"binary_name": "guile-gnutls",
"binary_version": "3.6.13-2ubuntu1.12+esm2"
},
{
"binary_name": "libgnutls-dane0",
"binary_version": "3.6.13-2ubuntu1.12+esm2"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.6.13-2ubuntu1.12+esm2"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.6.13-2ubuntu1.12+esm2"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.6.13-2ubuntu1.12+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.6.13-2ubuntu1.12+esm2?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.6.9-5ubuntu1",
"3.6.9-5ubuntu2",
"3.6.10-5",
"3.6.11.1-2",
"3.6.11.1-2ubuntu2",
"3.6.13-2ubuntu1",
"3.6.13-2ubuntu1.1",
"3.6.13-2ubuntu1.2",
"3.6.13-2ubuntu1.3",
"3.6.13-2ubuntu1.6",
"3.6.13-2ubuntu1.7",
"3.6.13-2ubuntu1.8",
"3.6.13-2ubuntu1.9",
"3.6.13-2ubuntu1.10",
"3.6.13-2ubuntu1.11",
"3.6.13-2ubuntu1.12",
"3.6.13-2ubuntu1.12+esm1",
"3.6.13-2ubuntu1.12+esm2"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.7.3-4ubuntu1.9"
},
{
"binary_name": "guile-gnutls",
"binary_version": "3.7.3-4ubuntu1.9"
},
{
"binary_name": "libgnutls-dane0",
"binary_version": "3.7.3-4ubuntu1.9"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.7.3-4ubuntu1.9"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.7.3-4ubuntu1.9"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.7.3-4ubuntu1.9"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.7.3-4ubuntu1.9?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.7.3-4ubuntu1.9"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.7.1-5ubuntu1",
"3.7.2-2ubuntu1",
"3.7.2-4ubuntu1",
"3.7.2-5ubuntu1",
"3.7.3-4ubuntu1",
"3.7.3-4ubuntu1.1",
"3.7.3-4ubuntu1.2",
"3.7.3-4ubuntu1.3",
"3.7.3-4ubuntu1.4",
"3.7.3-4ubuntu1.5",
"3.7.3-4ubuntu1.6",
"3.7.3-4ubuntu1.7",
"3.7.3-4ubuntu1.8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.7.3-4ubuntu1.2+Fips1.1"
},
{
"binary_name": "guile-gnutls",
"binary_version": "3.7.3-4ubuntu1.2+Fips1.1"
},
{
"binary_name": "libgnutls-dane0",
"binary_version": "3.7.3-4ubuntu1.2+Fips1.1"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.7.3-4ubuntu1.2+Fips1.1"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.7.3-4ubuntu1.2+Fips1.1"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.7.3-4ubuntu1.2+Fips1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-preview:22.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.7.3-4ubuntu1.2+Fips1.1?arch=source\u0026distro=fips-preview/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.7.3-4ubuntu1.2+Fips1.1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.7.3-4ubuntu1.9+Fips1"
},
{
"binary_name": "guile-gnutls",
"binary_version": "3.7.3-4ubuntu1.9+Fips1"
},
{
"binary_name": "libgnutls-dane0",
"binary_version": "3.7.3-4ubuntu1.9+Fips1"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.7.3-4ubuntu1.9+Fips1"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.7.3-4ubuntu1.9+Fips1"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.7.3-4ubuntu1.9+Fips1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:22.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.7.3-4ubuntu1.9+Fips1?arch=source\u0026distro=fips-updates/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.7.3-4ubuntu1.9+Fips1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.7.3-4ubuntu1.2+Fips1.1",
"3.7.3-4ubuntu1.3+Fips1.1",
"3.7.3-4ubuntu1.4+Fips1",
"3.7.3-4ubuntu1.5+Fips1",
"3.7.3-4ubuntu1.6+Fips1",
"3.7.3-4ubuntu1.7+Fips1",
"3.7.3-4ubuntu1.7+Fips1.1",
"3.7.3-4ubuntu1.8+Fips1.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.8.3-1.1ubuntu3.6"
},
{
"binary_name": "libgnutls-dane0t64",
"binary_version": "3.8.3-1.1ubuntu3.6"
},
{
"binary_name": "libgnutls-openssl27t64",
"binary_version": "3.8.3-1.1ubuntu3.6"
},
{
"binary_name": "libgnutls30t64",
"binary_version": "3.8.3-1.1ubuntu3.6"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.8.3-1.1ubuntu3.6?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-1.1ubuntu3.6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.8.1-4ubuntu1",
"3.8.1-4ubuntu6",
"3.8.1-4ubuntu7",
"3.8.3-1ubuntu1",
"3.8.3-1.1ubuntu2",
"3.8.3-1.1ubuntu3",
"3.8.3-1.1ubuntu3.1",
"3.8.3-1.1ubuntu3.2",
"3.8.3-1.1ubuntu3.3",
"3.8.3-1.1ubuntu3.4",
"3.8.3-1.1ubuntu3.5"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.8.3-1.1ubuntu3.6+Fips1.2"
},
{
"binary_name": "libgnutls-dane0t64",
"binary_version": "3.8.3-1.1ubuntu3.6+Fips1.2"
},
{
"binary_name": "libgnutls-openssl27t64",
"binary_version": "3.8.3-1.1ubuntu3.6+Fips1.2"
},
{
"binary_name": "libgnutls30t64",
"binary_version": "3.8.3-1.1ubuntu3.6+Fips1.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS-updates:24.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.8.3-1.1ubuntu3.6+Fips1.2?arch=source\u0026distro=fips-updates/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.3-1.1ubuntu3.6+Fips1.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.8.3-1.1ubuntu3.1+Fips1",
"3.8.3-1.1ubuntu3.4+Fips1",
"3.8.3-1.1ubuntu3.4+Fips1.1",
"3.8.3-1.1ubuntu3.5+Fips1.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.8.9-3ubuntu2.2"
},
{
"binary_name": "libgnutls-dane0t64",
"binary_version": "3.8.9-3ubuntu2.2"
},
{
"binary_name": "libgnutls-openssl27t64",
"binary_version": "3.8.9-3ubuntu2.2"
},
{
"binary_name": "libgnutls30t64",
"binary_version": "3.8.9-3ubuntu2.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.8.9-3ubuntu2.2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.9-3ubuntu2.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.8.9-2ubuntu3",
"3.8.9-3ubuntu1",
"3.8.9-3ubuntu2",
"3.8.9-3ubuntu2.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.8.12-2ubuntu1.1"
},
{
"binary_name": "libgnutls-dane0t64",
"binary_version": "3.8.12-2ubuntu1.1"
},
{
"binary_name": "libgnutls-openssl27t64",
"binary_version": "3.8.12-2ubuntu1.1"
},
{
"binary_name": "libgnutls30t64",
"binary_version": "3.8.12-2ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.8.12-2ubuntu1.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.12-2ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.8.9-3ubuntu2",
"3.8.10-3ubuntu1",
"3.8.12-2ubuntu1"
]
}
],
"aliases": [],
"details": "A flaw was found in gnutls. This vulnerability occurs because permitted name constraints were incorrectly ignored when previous Certificate Authorities (CAs) only had excluded name constraints. A remote attacker could exploit this to bypass critical name constraint checks during certificate validation. This bypass could lead to the acceptance of invalid certificates, potentially enabling spoofing or man-in-the-middle attacks against affected systems.",
"id": "UBUNTU-CVE-2026-42011",
"modified": "2026-07-06T14:11:22Z",
"published": "2026-05-07T15:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42011"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42011"
},
{
"type": "REPORT",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-6"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8284-1"
}
],
"related": [
"USN-8284-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42011"
]
}
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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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