CVE-2026-78301

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "BIND 9", "vendor": "ISC", "versions": [{"lessThanOrEqual": "9.18.50", "status": "affected", "version": "9.11.0", "versionType": "custom"}, {"lessThanOrEqual": "9.20.27", "status": "affected", "version": "9.20.0", "versionType": "custom"}, {"lessThanOrEqual": "9.21.25", "status": "affected", "version": "9.21.0", "versionType": "custom"}, {"lessThanOrEqual": "9.18.50-S1", "status": "affected", "version": "9.11.3-S1", "versionType": "custom"}, {"lessThanOrEqual": "9.20.27-S1", "status": "affected", "version": "9.20.9-S1", "versionType": "custom"}]}], "source": "security-officer@isc.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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.\nThis 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."}, {"lang": "es", "value": "Una zona malformada puede contener un nodo NS o DNAME por encima de su origen, que \u201cnamed\u201d trata como un corte de zona. Si un atacante inserta una zona malformada en un servidor autoritativo BIND (por ejemplo, mediante una transferencia de zona), las consultas para nombres dentro de la zona configurada pierden el estado autoritativo y devuelven una delegaci\u00f3n fuera de la zona. En un servidor que tambi\u00e9n proporciona recursi\u00f3n, BIND puede seguir este corte de origen local y almacenar en cach\u00e9 los datos suministrados por el atacante, afectando nombres fuera de la zona configurada. Esta situaci\u00f3n persiste mientras la zona malformada permanezca en la base de datos de zona.\\n\\nEste problema afecta a BIND?9 versiones desde 9.11.0 hasta 9.18.50 incluidas, desde 9.20.0 hasta 9.20.27 incluidas, desde 9.21.0 hasta 9.21.25 incluidas, desde 9.11.3?S1 hasta 9.18.50?S1 incluidas, y desde 9.20.9?S1 hasta 9.20.27?S1 incluidas."}], "id": "CVE-2026-78301", "lastModified": "2026-10-26T23:10:00.183", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 4.0, "source": "security-officer@isc.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-78301", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-17T18:43:00.321566Z", "version": "2.0.3"}}]}, "published": "2026-09-16T14:17:10.400", "references": [{"source": "security-officer@isc.org", "url": "https://downloads.isc.org/isc/bind9/9.20.29"}, {"source": "security-officer@isc.org", "url": "https://downloads.isc.org/isc/bind9/9.21.26"}, {"source": "security-officer@isc.org", "url": "https://kb.isc.org/docs/cve-2026-78301"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-349"}], "source": "security-officer@isc.org", "type": "Secondary"}]}

{"bugzilla": {"description": "bind: BIND: DNS cache poisoning via malformed zone insertion", "id": "2535463", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535463"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-168", "details": ["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."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, Red Hat recommends separating authoritative and recursive DNS functions onto different BIND instances or servers. This prevents a compromised authoritative zone from affecting recursive queries. Additionally, restrict zone transfer sources to trusted hosts only by configuring `allow-transfer` directives within your `named.conf` zone definitions. After modifying `named.conf`, the BIND service must be reloaded for changes to take effect, which may temporarily interrupt DNS resolution."}, "name": "CVE-2026-78301", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "bind9.16", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "bind9.18", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-16T13:58:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-78301\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-78301\nhttps://downloads.isc.org/isc/bind9/9.20.29\nhttps://downloads.isc.org/isc/bind9/9.21.26\nhttps://kb.isc.org/docs/cve-2026-78301"], "statement": "Moderate impact. BIND servers configured for both authoritative and recursive functions are vulnerable to DNS cache poisoning. An attacker who can insert a malformed zone, for example via zone transfer, can cause the server to cache attacker-supplied data for names outside the configured zone.", "threat_severity": "Moderate"}

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