Remote UDP DoS by sending multiple DNS Cookie options
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| NLnet Labs | NSD | unaffected |
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No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Nlnetlabs | Nsd |
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Vendor Solution
This issue is fixed in 4.15.1 and all later versions.
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.460% probability within 30 days)
| Link | Providers |
|---|---|
| https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19401.txt |
|
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:nlnetlabs:nsd:*:*:*:*:*:*:*:* | |
| Metrics |
cvssV3_1
|
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Nlnetlabs
Nlnetlabs nsd |
|
| Vendors & Products |
Nlnetlabs
Nlnetlabs nsd |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Remote UDP DoS by sending multiple DNS Cookie options | |
| Weaknesses | CWE-400 CWE-617 |
|
| References |
| |
| Metrics |
cvssV4_0
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