Bug 2494185

Summary: CVE-2026-12245 nsd: Denial of DNS over TLS service by any DoT client [fedora-all]
Product: [Fedora] Fedora Reporter: Marco Benatto <mbenatto>
Component: nsdAssignee: Paul Wouters <paul.wouters>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: drjohnson1, me, paul.wouters
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["3da5c003-69f1-4cee-adbf-1e9359e3e294"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2491588    

Description Marco Benatto 2026-06-29 13:48:52 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

If NSD is configured with DNS over TLS, a client that performs a TLS action, closing the connection early, causes a crash and restart of the server process. An attacker can keep all children in a crash-restart loop denying DoT service.