Bug 2500367

Summary: CVE-2026-10846 rbldnsd: ldns: Off-path poisoning attacks due to insufficient query-response matching [fedora-all]
Product: [Fedora] Fedora Reporter: Christopher Lusk <clusk>
Component: rbldnsdAssignee: Paul Howarth <paul>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: paul
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["63930efb-b642-45a5-8006-d535ac37660d"]}
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Last Closed: 2026-07-15 07:05:42 UTC Type: ---
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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: 2487437    

Description Christopher Lusk 2026-07-14 18:17:03 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.

NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination address and port with the response source address and port. Furthermore not the query ID, neither the question of the query is matched with that of the response. This makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.
Comment 1 Paul Howarth 2026-07-15 07:05:42 UTC 
This is an ldns issue, nothing to do with rbldnsd.