DEBIAN-CVE-2026-19401
Any remote client can crash a (debugging/non-release build type) NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options (17 when UDP payload size is 512). By continuously crashing the serve childs, the remote client can severely hamper or, when positioned sufficiently close, deny all DNS service.
DEBIAN-CVE-2026-19401
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-19401
nsd
Source reference: /affected/0/package/name
- Affected versions
- 4.10.1-1
Source reference:
/affected/0/versions4.10.1~rc2-1Source reference:
/affected/0/versions4.10.1~rc2-2Source reference:
/affected/0/versions4.11.0-1Source reference:
/affected/0/versions4.11.1-1Source reference:
/affected/0/versions4.12.0-1Source reference:
/affected/0/versions4.12.0-2Source reference:
/affected/0/versions4.13.0-1Source reference:
/affected/0/versions4.13.0-2Source reference:
/affected/0/versions4.13.0-3Source reference:
/affected/0/versions4.13.0-4Source reference:
/affected/0/versions4.13.0-5Source reference:
/affected/0/versions4.13.0-6Source reference:
/affected/0/versions4.14.0-1Source reference:
/affected/0/versions4.14.1-1Source reference:
/affected/0/versions4.14.2-1Source reference:
/affected/0/versions4.14.3-1Source reference:
/affected/0/versions4.15.0-1Source reference:
/affected/0/versions4.15.0~rc1-1Source reference:
/affected/0/versions4.15.1-1Source reference:
/affected/0/versions4.15.2-1Source reference:
/affected/0/versions4.6.1-1Source reference:
/affected/0/versions4.7.0-1Source reference:
/affected/0/versions4.8.0-1Source reference:
/affected/0/versions4.9.1-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
nsd
Source reference: /affected/1/package/name
- Affected versions
- 4.12.0-1
Source reference:
/affected/1/versions4.12.0-2Source reference:
/affected/1/versions4.13.0-1Source reference:
/affected/1/versions4.13.0-2Source reference:
/affected/1/versions4.13.0-3Source reference:
/affected/1/versions4.13.0-4Source reference:
/affected/1/versions4.13.0-5Source reference:
/affected/1/versions4.13.0-6Source reference:
/affected/1/versions4.14.0-1Source reference:
/affected/1/versions4.14.1-1Source reference:
/affected/1/versions4.14.2-1Source reference:
/affected/1/versions4.14.3-1Source reference:
/affected/1/versions4.15.0-1Source reference:
/affected/1/versions4.15.0~rc1-1Source reference:
/affected/1/versions4.15.1-1Source reference:
/affected/1/versions4.15.2-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
nsd
Source reference: /affected/2/package/name
- Affected versions
- 4.12.0-1
Source reference:
/affected/2/versions4.12.0-2Source reference:
/affected/2/versions4.13.0-1Source reference:
/affected/2/versions4.13.0-2Source reference:
/affected/2/versions4.13.0-3Source reference:
/affected/2/versions4.13.0-4Source reference:
/affected/2/versions4.13.0-5Source reference:
/affected/2/versions4.13.0-6Source reference:
/affected/2/versions4.14.0-1Source reference:
/affected/2/versions4.14.1-1Source reference:
/affected/2/versions4.14.2-1Source reference:
/affected/2/versions4.14.3-1Source reference:
/affected/2/versions4.15.0-1Source reference:
/affected/2/versions4.15.0~rc1-1Source reference:
/affected/2/versions - Fixed versions
- 4.15.1-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/debian/nsd?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.10.1-1",
"4.10.1~rc2-1",
"4.10.1~rc2-2",
"4.11.0-1",
"4.11.1-1",
"4.12.0-1",
"4.12.0-2",
"4.13.0-1",
"4.13.0-2",
"4.13.0-3",
"4.13.0-4",
"4.13.0-5",
"4.13.0-6",
"4.14.0-1",
"4.14.1-1",
"4.14.2-1",
"4.14.3-1",
"4.15.0-1",
"4.15.0~rc1-1",
"4.15.1-1",
"4.15.2-1",
"4.6.1-1",
"4.7.0-1",
"4.8.0-1",
"4.9.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/debian/nsd?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.12.0-1",
"4.12.0-2",
"4.13.0-1",
"4.13.0-2",
"4.13.0-3",
"4.13.0-4",
"4.13.0-5",
"4.13.0-6",
"4.14.0-1",
"4.14.1-1",
"4.14.2-1",
"4.14.3-1",
"4.15.0-1",
"4.15.0~rc1-1",
"4.15.1-1",
"4.15.2-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.15.1-1"
}
]
}
],
"package": {
"name": "nsd",
"purl": "pkg:deb/debian/nsd?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.12.0-1",
"4.12.0-2",
"4.13.0-1",
"4.13.0-2",
"4.13.0-3",
"4.13.0-4",
"4.13.0-5",
"4.13.0-6",
"4.14.0-1",
"4.14.1-1",
"4.14.2-1",
"4.14.3-1",
"4.15.0-1",
"4.15.0~rc1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #56189 · Revision 1
- Added to Heist Feed
- Publisher date