HighFix available
bind9 — security advisory
On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
- Products
- bind9
- Affected versions
- 1:9.18.12-1, 1:9.18.13-1, 1:9.18.16-1, 1:9.18.16-1~deb12u1, 1:9.18.16-1~deb12u1~bpo11+1, 1:9.18.19-1~deb12u1, 1:9.18.19-1~deb12u1~bpo11+1, 1:9.18.24-1, 1:9.18.24-1~bpo11+1, 1:9.18.28-1~deb12u1, 1:9.18.28-1~deb12u2, 1:9.18.33-1~deb12u2, 1:9.18.41-1~deb12u1, 1:9.18.44-1~deb12u1, 1:9.18.47-1~deb12u1, 1:9.18.49-1~deb12u1, 1:9.18.49-1~deb12u2, 1:9.20.11-4, 1:9.20.15-1, 1:9.20.15-1~deb13u1, 1:9.20.15-1~deb13u1~bpo12+1, 1:9.20.15-2, 1:9.20.18-1, 1:9.20.18-1~deb13u1, 1:9.20.18-1~deb13u1~bpo12+1, 1:9.20.19-1, 1:9.20.19-1~bpo12+1, 1:9.20.20-1, 1:9.20.20-1~bpo12+1, 1:9.20.21-1, 1:9.20.21-1~deb13u1, 1:9.20.21-1~deb13u1~bpo12+1, 1:9.20.22-1, 1:9.20.23-1, 1:9.20.23-1~deb13u1, 1:9.20.23-1~deb13u1~bpo12+1, 1:9.20.24-1, 1:9.20.26-1, 1:9.20.26-1~deb13u1, 1:9.20.26-1~deb13u1~bpo12+1, 1:9.20.27-1, 1:9.20.27-2, 1:9.20.29-1~deb13u1
- Fixed versions
- 1:9.18.49-1~deb12u3, 1:9.20.29-1, 1:9.20.29-1~deb13u1
- CVEs
- CVE-2026-19666
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 21:52 UTC · Revision 1
Source evidence
On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
osv:DEBIAN-CVE-2026-19666
bind9
Fixed versions: 1:9.18.49-1~deb12u3
bind9
Fixed versions: 1:9.20.29-1~deb13u1
bind9
Fixed versions: 1:9.20.29-1
Complete source record
{
"id": "4a036d6e7b16ab5320fa68b6adef310cbb6763ccf3d27ff363a985df1eace532",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-19666",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-19666",
"summary": "On a resolver configured to use ``dns64``, if an applicable answer from the authoritative server is malformed in a specific way, the resolver `named` process will exit unexpectedly. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.",
"evidence": "osv:DEBIAN-CVE-2026-19666",
"products": [
{
"name": {
"value": "bind9",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.18.49-1~deb12u3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1:9.18.12-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.13-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.16-1~deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.19-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.19-1~deb12u1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.24-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.24-1~bpo11+1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.28-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.28-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.33-1~deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.41-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.44-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.47-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.49-1~deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:9.18.49-1~deb12u2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.20.29-1~deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1:9.20.11-4",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.15-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.18-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.18-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.18-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.19-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.19-1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.20-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.20-1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.21-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.21-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.21-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.22-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.23-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.23-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.23-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.24-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.26-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.26-1~deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.26-1~deb13u1~bpo12+1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.27-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:9.20.27-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "bind9",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1:9.20.29-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1:9.20.11-4",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.15-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.18-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.18-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.18-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.19-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.19-1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.20-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.20-1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.21-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.21-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.21-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.22-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.23-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.23-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.23-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.24-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.26-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.26-1~deb13u1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.26-1~deb13u1~bpo12+1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.27-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.27-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:9.20.29-1~deb13u1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-19666",
"aliases": [
"DEBIAN-CVE-2026-19666"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.18.49-1~deb12u3"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:9.18.12-1",
"1:9.18.13-1",
"1:9.18.16-1",
"1:9.18.16-1~deb12u1",
"1:9.18.16-1~deb12u1~bpo11+1",
"1:9.18.19-1~deb12u1",
"1:9.18.19-1~deb12u1~bpo11+1",
"1:9.18.24-1",
"1:9.18.24-1~bpo11+1",
"1:9.18.28-1~deb12u1",
"1:9.18.28-1~deb12u2",
"1:9.18.33-1~deb12u2",
"1:9.18.41-1~deb12u1",
"1:9.18.44-1~deb12u1",
"1:9.18.47-1~deb12u1",
"1:9.18.49-1~deb12u1",
"1:9.18.49-1~deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19666.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.20.29-1~deb13u1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:9.20.11-4",
"1:9.20.15-1",
"1:9.20.15-1~deb13u1",
"1:9.20.15-1~deb13u1~bpo12+1",
"1:9.20.15-2",
"1:9.20.18-1",
"1:9.20.18-1~deb13u1",
"1:9.20.18-1~deb13u1~bpo12+1",
"1:9.20.19-1",
"1:9.20.19-1~bpo12+1",
"1:9.20.20-1",
"1:9.20.20-1~bpo12+1",
"1:9.20.21-1",
"1:9.20.21-1~deb13u1",
"1:9.20.21-1~deb13u1~bpo12+1",
"1:9.20.22-1",
"1:9.20.23-1",
"1:9.20.23-1~deb13u1",
"1:9.20.23-1~deb13u1~bpo12+1",
"1:9.20.24-1",
"1:9.20.26-1",
"1:9.20.26-1~deb13u1",
"1:9.20.26-1~deb13u1~bpo12+1",
"1:9.20.27-1",
"1:9.20.27-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19666.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1:9.20.29-1"
}
]
}
],
"package": {
"name": "bind9",
"purl": "pkg:deb/debian/bind9?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:9.20.11-4",
"1:9.20.15-1",
"1:9.20.15-1~deb13u1",
"1:9.20.15-1~deb13u1~bpo12+1",
"1:9.20.15-2",
"1:9.20.18-1",
"1:9.20.18-1~deb13u1",
"1:9.20.18-1~deb13u1~bpo12+1",
"1:9.20.19-1",
"1:9.20.19-1~bpo12+1",
"1:9.20.20-1",
"1:9.20.20-1~bpo12+1",
"1:9.20.21-1",
"1:9.20.21-1~deb13u1",
"1:9.20.21-1~deb13u1~bpo12+1",
"1:9.20.22-1",
"1:9.20.23-1",
"1:9.20.23-1~deb13u1",
"1:9.20.23-1~deb13u1~bpo12+1",
"1:9.20.24-1",
"1:9.20.26-1",
"1:9.20.26-1~deb13u1",
"1:9.20.26-1~deb13u1~bpo12+1",
"1:9.20.27-1",
"1:9.20.27-2",
"1:9.20.29-1~deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19666.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-28T00:00:30.001336022Z",
"provider": "osv",
"upstream": [
"CVE-2026-19666"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-19666"
]
},
"related_cves": [
{
"value": "CVE-2026-19666",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 173504,
"published_at": "2026-09-16T15:17:33.52+00:00"
}