Bug 2535463 (CVE-2026-78301)

Summary: CVE-2026-78301 bind: BIND: DNS cache poisoning via malformed zone insertion
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in BIND, a widely used Domain Name System (DNS) software. A remote attacker could exploit this by introducing a specially crafted, malformed DNS zone into an authoritative BIND server. This action could cause the server to incorrectly delegate authority for parts of its own configured zones. As a result, if the server also performs recursive lookups, it might cache incorrect information provided by the attacker, leading to DNS cache poisoning and potentially redirecting users to malicious websites or services.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2535872    
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Description OSIDB Bzimport 2026-09-16 14:26:30 UTC 
A malformed zone may contain an NS or DNAME node above its origin, which `named` treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.