VULNERABILITY INTELLIGENCE

CVE-2026-19401

CVSS score7.5 HIGH
EPSS probability0.46%
CISA KEVNot currently listed
Published2026-08-26
Last modified2026-09-08
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Weakness classification

  • sep@nlnetlabs.nl: CWE-400

Primary references