Bug 2396342 (CVE-2025-30187)

Summary: CVE-2025-30187 DNSdist: Denial of service via crafted DoH exchange in PowerDNS DNSdist
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in DNSdist. When DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, a specially crafted DoH (DNS-over-HTTPS) exchange can cause an unbound I/O read loop and result in an unexpected consumption of CPU resources.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2396484, 2396485, 2396486    
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Description OSIDB Bzimport 2025-09-18 10:01:09 UTC
In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.