VDB
CVE-2026-19401
CVE-2026-19401
PUBLISHED
CVSS 8.2 HIGH
Reported by NLnet Labs · Published August 26, 2026
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.
Risk Scores
CVSS 4.0
8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| NLnet Labs | NSD | 4.3.7 |
| NLnet Labs | NSD | 4.3.7 |
| alpine | nsd | 0 |
Timeline
- Aug 26, 2026 EPSS Score
- Aug 26, 2026 Coalition ESS Score
- Aug 26, 2026 CVE Published
- Aug 30, 2026 EPSS Score
- Sep 2, 2026 Security Advisory
- Sep 4, 2026 EPSS Score
- Sep 8, 2026 CVE Updated
- Sep 9, 2026 EPSS Score
- Sep 12, 2026 EPSS Score
- Sep 16, 2026 EPSS Score
- Sep 18, 2026 EPSS Score
- Sep 24, 2026 EPSS Score