HighFix available
bind9, bind9-libs and 1 more products — security advisory
The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
- Products
- bind9, bind9-libs, isc-dhcp
- Affected versions
- 1:9.11.16+dfsg-3~build1, 1:9.11.16+dfsg-3~ubuntu1, 1:9.11.19+dfsg-2.1ubuntu1, 1:9.11.19+dfsg-2.1ubuntu2, 1:9.11.19+dfsg-2.1ubuntu3, 1:9.16.15-1ubuntu1, 1:9.16.15-1ubuntu2, 1:9.16.15-1ubuntu3, 1:9.18.0-2ubuntu1, 1:9.18.0-2ubuntu2, 1:9.18.0-2ubuntu3, 1:9.18.1-1ubuntu1, 1:9.18.1-1ubuntu1.1, 1:9.18.1-1ubuntu1.2, 1:9.18.1-1ubuntu1.3, 1:9.18.12-0ubuntu0.22.04.1, 1:9.18.12-0ubuntu0.22.04.2, 1:9.18.12-0ubuntu0.22.04.3, 1:9.18.18-0ubuntu0.22.04.1, 1:9.18.18-0ubuntu0.22.04.2, 1:9.18.18-0ubuntu2, 1:9.18.21-0ubuntu1, 1:9.18.24-0ubuntu0.22.04.1, 1:9.18.24-0ubuntu3, 1:9.18.24-0ubuntu4, 1:9.18.24-0ubuntu5, 1:9.18.28-0ubuntu0.22.04.1, 1:9.18.28-0ubuntu0.24.04.1, 1:9.18.30-0ubuntu0.22.04.1, 1:9.18.30-0ubuntu0.22.04.2, 1:9.18.30-0ubuntu0.24.04.1, 1:9.18.30-0ubuntu0.24.04.2, 1:9.18.39-0ubuntu0.22.04.1, 1:9.18.39-0ubuntu0.22.04.2, 1:9.18.39-0ubuntu0.22.04.3, 1:9.18.39-0ubuntu0.22.04.4, 1:9.18.39-0ubuntu0.24.04.1, 1:9.18.39-0ubuntu0.24.04.2, 1:9.18.39-0ubuntu0.24.04.3, 1:9.18.39-0ubuntu0.24.04.5, 1:9.20.11-1ubuntu2, 1:9.20.11-1ubuntu3, 1:9.20.18-1ubuntu1, 1:9.20.18-1ubuntu2, 1:9.20.18-1ubuntu2.1, 1:9.20.24-1ubuntu0.1, 4.3.5-3ubuntu2, 4.3.5-3ubuntu3, 4.3.5-3ubuntu4, 4.3.5-3ubuntu5, 4.3.5-3ubuntu6, 4.3.5-3ubuntu7, 4.3.5-3ubuntu7.1, 4.3.5-3ubuntu7.2, 4.3.5-3ubuntu7.3, 4.3.5-3ubuntu7.4, 4.4.3-P1-2ubuntu5, 4.4.3-P1-4ubuntu1, 4.4.3-P1-4ubuntu2
- Fixed versions
- 1:9.18.39-0ubuntu0.22.04.5, 1:9.18.39-0ubuntu0.24.04.6, 1:9.20.24-1ubuntu0.2
- CVEs
- CVE-2026-12617
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 08:49 UTC · Revision 1
Source evidence
The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
osv:UBUNTU-CVE-2026-12617
isc-dhcp
Fixed versions: Not specified
bind9-libs
Fixed versions: Not specified
bind9
Fixed versions: 1:9.18.39-0ubuntu0.22.04.5
bind9-libs
Fixed versions: Not specified
bind9
Fixed versions: 1:9.18.39-0ubuntu0.24.04.6
isc-dhcp
Fixed versions: Not specified
bind9
Fixed versions: 1:9.20.24-1ubuntu0.2
isc-dhcp
Fixed versions: Not specified
Complete source record
{
"id": "e8ca557356419d243b50f2506f0ab5d66207b5b60c866730591bbfccaf2c7d5b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-12617",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-12617",
"summary": "The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, and the authoritative server responds positively to the A query but delays the DNAME response and later responds negatively, `named` may quit unexpectedly. Or, if a client queries for a CNAME and A record for the same name to the resolver, and the authoritative server responds positively to the A query but delays the CNAME response and later responds with a self-referential CNAME, the same failure may occur. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.24, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.",
"evidence": "osv:UBUNTU-CVE-2026-12617",
"products": [
{
"name": {
"value": "isc-dhcp",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.3.5-3ubuntu2",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu4",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu5",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu6",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu7",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu7.1",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu7.2",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu7.3",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.5-3ubuntu7.4",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "bind9-libs",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:9.11.16+dfsg-3~build1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.11.16+dfsg-3~ubuntu1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.18.39-0ubuntu0.22.04.5",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:9.16.15-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.16.15-1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.16.15-1ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.0-2ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.0-2ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.0-2ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.1-1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.1-1ubuntu1.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.1-1ubuntu1.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.1-1ubuntu1.3",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.12-0ubuntu0.22.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.12-0ubuntu0.22.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.12-0ubuntu0.22.04.3",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.18-0ubuntu0.22.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.18-0ubuntu0.22.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.24-0ubuntu0.22.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.28-0ubuntu0.22.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.30-0ubuntu0.22.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.30-0ubuntu0.22.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.39-0ubuntu0.22.04.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.39-0ubuntu0.22.04.2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.39-0ubuntu0.22.04.3",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.18.39-0ubuntu0.22.04.4",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "bind9-libs",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:9.11.19+dfsg-2.1ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "1:9.11.19+dfsg-2.1ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "1:9.11.19+dfsg-2.1ubuntu3",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.18.39-0ubuntu0.24.04.6",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "1:9.18.18-0ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.21-0ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.24-0ubuntu3",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.24-0ubuntu4",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.24-0ubuntu5",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.28-0ubuntu0.24.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.30-0ubuntu0.24.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.30-0ubuntu0.24.04.2",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.39-0ubuntu0.24.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.39-0ubuntu0.24.04.2",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.39-0ubuntu0.24.04.3",
"evidence": "/affected/4/versions"
},
{
"value": "1:9.18.39-0ubuntu0.24.04.5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "isc-dhcp",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.4.3-P1-2ubuntu5",
"evidence": "/affected/5/versions"
},
{
"value": "4.4.3-P1-4ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "4.4.3-P1-4ubuntu2",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.20.24-1ubuntu0.2",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": [
{
"value": "1:9.20.11-1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1:9.20.11-1ubuntu3",
"evidence": "/affected/6/versions"
},
{
"value": "1:9.20.18-1ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "1:9.20.18-1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1:9.20.18-1ubuntu2.1",
"evidence": "/affected/6/versions"
},
{
"value": "1:9.20.24-1ubuntu0.1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "isc-dhcp",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.4.3-P1-4ubuntu2",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-12617",
"aliases": [
"UBUNTU-CVE-2026-12617"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "isc-dhcp",
"purl": "pkg:deb/ubuntu/isc-dhcp?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"4.3.5-3ubuntu2",
"4.3.5-3ubuntu3",
"4.3.5-3ubuntu4",
"4.3.5-3ubuntu5",
"4.3.5-3ubuntu6",
"4.3.5-3ubuntu7",
"4.3.5-3ubuntu7.1",
"4.3.5-3ubuntu7.2",
"4.3.5-3ubuntu7.3",
"4.3.5-3ubuntu7.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12617.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "isc-dhcp-client",
"binary_version": "4.3.5-3ubuntu7.4"
},
{
"binary_name": "isc-dhcp-client-ddns",
"binary_version": "4.3.5-3ubuntu7.4"
},
{
"binary_name": "isc-dhcp-common",
"binary_version": "4.3.5-3ubuntu7.4"
},
{
"binary_name": "isc-dhcp-relay",
"binary_version": "4.3.5-3ubuntu7.4"
},
{
"binary_name": "isc-dhcp-server",
"binary_version": "4.3.5-3ubuntu7.4"
},
{
"binary_name": "isc-dhcp-server-ldap",
"binary_version": "4.3.5-3ubuntu7.4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "bind9-libs",
"purl": "pkg:deb/ubuntu/bind9-libs?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1:9.11.16+dfsg-3~build1",
"1:9.11.16+dfsg-3~ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12617.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbind9-161",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libdns-export1109",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libdns1109",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libirs-export161",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libirs161",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libisc-export1105",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libisc1105",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libisccc-export161",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libisccc161",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libisccfg-export163",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "libisccfg163",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
},
{
"binary_name": "liblwres161",
"binary_version": "1:9.11.16+dfsg-3~ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.18.39-0ubuntu0.22.04.5"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/ubuntu/bind9?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:9.16.15-1ubuntu1",
"1:9.16.15-1ubuntu2",
"1:9.16.15-1ubuntu3",
"1:9.18.0-2ubuntu1",
"1:9.18.0-2ubuntu2",
"1:9.18.0-2ubuntu3",
"1:9.18.1-1ubuntu1",
"1:9.18.1-1ubuntu1.1",
"1:9.18.1-1ubuntu1.2",
"1:9.18.1-1ubuntu1.3",
"1:9.18.12-0ubuntu0.22.04.1",
"1:9.18.12-0ubuntu0.22.04.2",
"1:9.18.12-0ubuntu0.22.04.3",
"1:9.18.18-0ubuntu0.22.04.1",
"1:9.18.18-0ubuntu0.22.04.2",
"1:9.18.24-0ubuntu0.22.04.1",
"1:9.18.28-0ubuntu0.22.04.1",
"1:9.18.30-0ubuntu0.22.04.1",
"1:9.18.30-0ubuntu0.22.04.2",
"1:9.18.39-0ubuntu0.22.04.1",
"1:9.18.39-0ubuntu0.22.04.2",
"1:9.18.39-0ubuntu0.22.04.3",
"1:9.18.39-0ubuntu0.22.04.4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12617.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "bind9",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
},
{
"binary_name": "bind9-dnsutils",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
},
{
"binary_name": "bind9-host",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
},
{
"binary_name": "bind9-libs",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
},
{
"binary_name": "bind9-utils",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
},
{
"binary_name": "bind9utils",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
},
{
"binary_name": "dnsutils",
"binary_version": "1:9.18.39-0ubuntu0.22.04.5"
}
],
"availability": "No subscription required"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "bind9-libs",
"purl": "pkg:deb/ubuntu/bind9-libs?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:9.11.19+dfsg-2.1ubuntu1",
"1:9.11.19+dfsg-2.1ubuntu2",
"1:9.11.19+dfsg-2.1ubuntu3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12617.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbind9-161",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libdns-export1110",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libdns1110",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libirs-export161",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libirs161",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libisc-export1105",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libisc1105",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libisccc-export161",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
{
"binary_name": "libisccc161",
"binary_version": "1:9.11.19+dfsg-2.1ubuntu3"
},
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],
"modified": "2026-10-12T20:15:03.911731113Z",
"provider": "osv",
"upstream": [
"CVE-2026-12617"
],
"references": [
"https://ubuntu.com/security/CVE-2026-12617",
"https://www.cve.org/CVERecord?id=CVE-2026-12617",
"https://kb.isc.org/docs/cve-2026-12617",
"https://ubuntu.com/security/notices/USN-8648-1"
]
},
"related_cves": [
{
"value": "CVE-2026-12617",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 306754,
"published_at": "2026-07-22T15:16:00+00:00"
}