CVE-2026-19401
CVE-2026-19401 · Remote UDP DoS by sending multiple DNS Cookie options
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.2 · High · EPSS 0.3% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
nsd
- Versions
- ≥ 4.3.7, < 4.15.1: Affected (semver)
Update to 4.15.1
nsd 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
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd 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
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd 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
- Affected ranges
- ECOSYSTEM: < 4.15.1-1
Update to 4.15.1-1
nsd Ubuntu:Pro:16.04:LTS
- Versions
- 4.1.2-1
- 4.1.6-1
- 4.1.7-1
- 4.1.7-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:Pro:18.04:LTS
- Versions
- 4.1.16-1build1
- 4.1.17-1
- 4.1.17-1build1
- 4.1.17-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:Pro:20.04:LTS
- Versions
- 4.1.26-1
- 4.1.26-1build1
- 4.1.26-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd 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
- 4.3.9-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:Pro:24.04:LTS
- Versions
- 4.7.0-1
- 4.8.0-1
- 4.8.0-1build1
- 4.8.0-1build3
- 4.8.0-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:26.10
- Versions
- 4.14.0-1
- 4.14.2-1
- 4.14.3-1
- 4.15.0-1
- 4.15.0-1build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
nsd Ubuntu:Pro:26.04:LTS
- Versions
- 4.12.0-1
- 4.13.0-6
- 4.14.0-1
- 4.14.0-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published