Unrated severityNVD Advisory· Published Aug 26, 2026· Updated Aug 26, 2026
Remote UDP DoS by sending multiple DNS Cookie options
CVE-2026-19401
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.
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Affected products
1Patches
Vulnerability mechanics
References
1- www.nlnetlabs.nl/downloads/nsd/CVE-2026-19401.txtmitrevendor-advisory
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