HighFix available
nsd — security advisory
NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.
- Products
- nsd
- Affected versions
- 4.1.16-1build1, 4.1.17-1, 4.1.17-1build1, 4.1.2-1, 4.1.26-1, 4.1.26-1build1, 4.1.6-1, 4.1.7-1, 4.11.1-1, 4.12.0-1, 4.13.0-6, 4.14.0-1, 4.14.2-1, 4.14.3-1, 4.15.0-1, 4.15.0-1build1, 4.3.5-1, 4.3.7-1, 4.3.8-1, 4.3.8-1build1, 4.3.9-1, 4.7.0-1, 4.8.0-1, 4.8.0-1build1, 4.8.0-1build3
- Fixed versions
- 4.1.17-1ubuntu0.1~esm1, 4.1.26-1ubuntu0.1~esm1, 4.1.7-1ubuntu0.1~esm1, 4.14.0-1ubuntu0.1~esm1, 4.3.9-1ubuntu0.1~esm1, 4.8.0-1ubuntu0.1~esm1
- CVEs
- CVE-2026-12246
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:02 UTC · Revision 1
Source evidence
NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.
osv:UBUNTU-CVE-2026-12246
nsd
Fixed versions: 4.1.7-1ubuntu0.1~esm1
nsd
Fixed versions: 4.1.17-1ubuntu0.1~esm1
nsd
Fixed versions: 4.1.26-1ubuntu0.1~esm1
nsd
Fixed versions: 4.3.9-1ubuntu0.1~esm1
nsd
Fixed versions: 4.8.0-1ubuntu0.1~esm1
nsd
Fixed versions: Not specified
nsd
Fixed versions: Not specified
nsd
Fixed versions: 4.14.0-1ubuntu0.1~esm1
Complete source record
{
"id": "52dd98842063d05d7a26761e5ea45b9545fda8b91e956db72d5e2cd523a7d4d9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-12246",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-12246",
"summary": "NSD version 4.14.0 introduced a bug where a specially crafted APL RR, with an adflength larger than permitted for the address family will overwrite the stack when the zone is written to disk, with a maximum of 111 attacker controlled bytes.",
"evidence": "osv:UBUNTU-CVE-2026-12246",
"products": [
{
"name": {
"value": "nsd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.1.7-1ubuntu0.1~esm1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "4.1.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.6-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.7-1",
"evidence": "/affected/0/versions"
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},
{
"name": {
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"evidence": "/affected/1/package/name"
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{
"value": "4.1.17-1ubuntu0.1~esm1",
"evidence": "/affected/1/ranges"
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"affected_versions": [
{
"value": "4.1.16-1build1",
"evidence": "/affected/1/versions"
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{
"value": "4.1.17-1",
"evidence": "/affected/1/versions"
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{
"value": "4.1.17-1build1",
"evidence": "/affected/1/versions"
}
]
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{
"name": {
"value": "nsd",
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"fixed_versions": [
{
"value": "4.1.26-1ubuntu0.1~esm1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.1.26-1",
"evidence": "/affected/2/versions"
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{
"value": "4.1.26-1build1",
"evidence": "/affected/2/versions"
}
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{
"name": {
"value": "nsd",
"evidence": "/affected/3/package/name"
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"fixed_versions": [
{
"value": "4.3.9-1ubuntu0.1~esm1",
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],
"affected_versions": [
{
"value": "4.3.5-1",
"evidence": "/affected/3/versions"
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{
"value": "4.3.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.3.8-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.3.8-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "4.3.9-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "nsd",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.8.0-1ubuntu0.1~esm1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "4.7.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.8.0-1",
"evidence": "/affected/4/versions"
},
{
"value": "4.8.0-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "4.8.0-1build3",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "nsd",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.11.1-1",
"evidence": "/affected/5/versions"
},
{
"value": "4.12.0-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "nsd",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.14.0-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.14.2-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.14.3-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.15.0-1",
"evidence": "/affected/6/versions"
},
{
"value": "4.15.0-1build1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "nsd",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.14.0-1ubuntu0.1~esm1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": [
{
"value": "4.12.0-1",
"evidence": "/affected/7/versions"
},
{
"value": "4.13.0-6",
"evidence": "/affected/7/versions"
},
{
"value": "4.14.0-1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-12246",
"aliases": [
"UBUNTU-CVE-2026-12246"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.7-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"4.1.2-1",
"4.1.6-1",
"4.1.7-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.1.7-1ubuntu0.1~esm1"
},
{
"binary_name": "nsd3",
"binary_version": "4.1.7-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.17-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"4.1.16-1build1",
"4.1.17-1",
"4.1.17-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.1.17-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.1.26-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"4.1.26-1",
"4.1.26-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.1.26-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.3.9-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"4.3.5-1",
"4.3.7-1",
"4.3.8-1",
"4.3.8-1build1",
"4.3.9-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.3.9-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.8.0-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"4.7.0-1",
"4.8.0-1",
"4.8.0-1build1",
"4.8.0-1build3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.8.0-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"4.11.1-1",
"4.12.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.12.0-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"4.14.0-1",
"4.14.2-1",
"4.14.3-1",
"4.15.0-1",
"4.15.0-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.15.0-1build1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.14.0-1ubuntu0.1~esm1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/ubuntu/nsd?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"versions": [
"4.12.0-1",
"4.13.0-6",
"4.14.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12246.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "nsd",
"binary_version": "4.14.0-1ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
}
],
"modified": "2026-10-17T12:58:04.913111745Z",
"provider": "osv",
"upstream": [
"CVE-2026-12246"
],
"references": [
"https://ubuntu.com/security/CVE-2026-12246",
"https://ubuntu.com/security/notices/USN-8474-1",
"https://www.cve.org/CVERecord?id=CVE-2026-12246"
]
},
"related_cves": [
{
"value": "CVE-2026-12246",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 357980,
"published_at": "2026-06-25T00:00:00+00:00"
}