CVE-2026-82399

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{"affected": [{"affectedData": [{"product": "coredns", "vendor": "coredns", "versions": [{"status": "affected", "version": "< 1.14.7"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "CoreDNS is a DNS server written in Go. Prior to 1.14.7, the DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC request paths in plugin/pkg/doh/doh.go, core/dnsserver/server_quic.go, and core/dnsserver/server_grpc.go call dns.Msg.Unpack on attacker-controlled DNS section counts before dns.DefaultMsgAcceptFunc validates the fixed header. An unauthenticated client can use DNS name compression and excessive section counts to amplify allocation before the plugin chain, so plugin-level rate limiting cannot prevent concurrent requests from exhausting memory and terminating CoreDNS. The ordinary UDP and TCP listeners are not affected because they validate the header first. This issue is fixed in version 1.14.7."}], "id": "CVE-2026-82399", "lastModified": "2026-09-24T21:16:28.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-82399", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-18T18:18:56.250464Z", "version": "2.0.3"}}]}, "published": "2026-09-16T19:17:44.627", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9"}, {"source": "security-advisories@github.com", "url": "https://github.com/coredns/coredns/releases/tag/v1.14.7"}, {"source": "security-advisories@github.com", "url": "https://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "github.com/coredns/coredns: CoreDNS: Denial of Service due to unauthenticated memory exhaustion in custom transports", "id": "2535609", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535609"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1050", "details": ["A flaw was found in CoreDNS. An unauthenticated remote attacker can exploit this vulnerability by sending specially crafted DNS requests over custom transports, such as DNS-over-HTTPS, DNS-over-HTTP/3, DNS-over-QUIC, and DNS-over-gRPC. By using DNS name compression and excessive section counts, the attacker can cause the server to exhaust its memory, leading to a Denial of Service (DoS) where CoreDNS terminates. The ordinary UDP and TCP listeners are not affected."], "name": "CVE-2026-82399", "package_state": [{"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Affected", "package_name": "rhacm2/lighthouse-agent-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:acm:2", "fix_state": "Affected", "package_name": "rhacm2/lighthouse-coredns-rhel9", "product_name": "Red Hat Advanced Cluster Management for Kubernetes 2"}, {"cpe": "cpe:/a:redhat:connectivity_link:1", "fix_state": "Affected", "package_name": "rhcl-1/coredns-rhel9", "product_name": "Red Hat Connectivity Link 1"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-coredns", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-coredns-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-16T18:37:55Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-82399\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-82399\nhttps://github.com/coredns/coredns/commit/530b0a5ff2ad68cc0421f10dd93568945cc671c9\nhttps://github.com/coredns/coredns/releases/tag/v1.14.7\nhttps://github.com/coredns/coredns/security/advisories/GHSA-mrg3-qvqr-jw29"], "threat_severity": "Important"}

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