Bug 2506754

Summary: CVE-2026-52684 pdns-recursor: prefetch feature allows persistent ghost domain cache poisoning attack [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: pdns-recursorAssignee: Filipe Rosset <rosset.filipe>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: epel10CC: rosset.filipe, ruben, sander
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["b6dc092c-08a0-46f8-ba09-fdea064aa5cc"]}
Fixed In Version: Doc Type: ---
Doc Text:
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Clone Of: Environment:
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Regression: --- Mount Type: ---
Documentation: --- CRM:
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2506361    

Description Guilherme de Almeida Suckevicz 2026-07-24 14:58:58 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 the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the 
child records are used immediately if not expired and thus valid, or the
 records are expired, and in that case not used.  So this case 
can only happen if almost expired records are used to refresh the 
authoritative NS records.