DEBIAN-CVE-2026-19401

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Source
https://security-tracker.debian.org/tracker/CVE-2026-19401
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-19401
Upstream
Published
2026-08-26T09:16:45Z
Modified
2026-09-09T09:00:15Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / nsd

Package

Name
nsd
Purl
pkg:deb/debian/nsd?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.6.1-1
4.7.0-1
4.8.0-1
4.9.1-1
4.10.1~rc2-1
4.10.1~rc2-2
4.10.1-1
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~rc1-1
4.15.0-1
4.15.1-1
4.15.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json"

Debian:13 / nsd

Package

Name
nsd
Purl
pkg:deb/debian/nsd?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
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~rc1-1
4.15.0-1
4.15.1-1
4.15.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json"

Debian:14 / nsd

Package

Name
nsd
Purl
pkg:deb/debian/nsd?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.15.1-1

Affected versions

4.*
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~rc1-1
4.15.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-19401.json"