Bug 2453322 (CVE-2026-0397)

Summary: CVE-2026-0397 dnsdist: dnsdist and PowerDNS: Information Disclosure via Cross-Origin Resource Sharing (CORS) Misconfiguration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the internal webserver of dnsdist and PowerDNS. When the internal webserver is enabled, a remote attacker can exploit a misconfiguration in the Cross-Origin Resource Sharing (CORS) policy. By tricking an administrator logged into the dashboard into visiting a malicious website, the attacker could extract sensitive information about the running configuration, leading to information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2453424, 2453427    
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Description OSIDB Bzimport 2026-03-31 12:01:52 UTC 
When the internal webserver is enabled (default is disabled), an attacker might be able to trick an administrator logged to the dashboard into visiting a malicious website and extract information about the running configuration from the dashboard. The root cause of the issue is a misconfiguration of the Cross-Origin Resource Sharing (CORS) policy.