Bug 2453335 (CVE-2026-0396)

Summary: CVE-2026-0396 dnsdist: dnsdist: HTML injection via crafted DNS queries
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in dnsdist. A remote attacker could exploit this vulnerability by sending specially crafted DNS queries to a dnsdist instance where domain-based dynamic rules have been enabled. This could allow the attacker to inject malicious HTML content into the internal web dashboard, potentially leading to information disclosure or defacement.
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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: 2453422, 2453430    
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Description OSIDB Bzimport 2026-03-31 12:02:53 UTC
An attacker might be able to inject HTML content into the internal web dashboard by sending crafted DNS queries to a DNSdist instance where domain-based dynamic rules have been enabled via either DynBlockRulesGroup:setSuffixMatchRule or DynBlockRulesGroup:setSuffixMatchRuleFFI.