Bug 2524300 (CVE-2026-19401) - CVE-2026-19401 nsd: NSD: Remote denial of service via crafted DNS Cookie options
Summary: CVE-2026-19401 nsd: NSD: Remote denial of service via crafted DNS Cookie options
Keywords:
Status: NEW
Alias: CVE-2026-19401
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2524355 2524356
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-26 08:53 UTC by OSIDB Bzimport
Modified: 2026-08-26 11:39 UTC (History)
0 users

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2026-08-26 08:53:14 UTC 
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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