CVE-2026-19401 — Remote UDP DoS by sending multiple DNS Cookie options
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 …
Published: 2026-08-26 · CVSS: 8.2 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7