CVE-2026-97313

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "BIND 9", "vendor": "ISC", "versions": [{"lessThanOrEqual": "9.18.50", "status": "affected", "version": "9.16.0", "versionType": "custom"}, {"lessThanOrEqual": "9.20.29", "status": "affected", "version": "9.20.0", "versionType": "custom"}, {"lessThanOrEqual": "9.21.26", "status": "affected", "version": "9.21.0", "versionType": "custom"}, {"lessThanOrEqual": "9.18.50-S1", "status": "affected", "version": "9.11.3-S1", "versionType": "custom"}, {"lessThanOrEqual": "9.20.29-S1", "status": "affected", "version": "9.20.9-S1", "versionType": "custom"}]}], "source": "security-officer@isc.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A recursive BIND server that receives a query with recursion desired (RD=1) followed by a non-recursive query (RD=0) may exit with an assertion failure, resulting in a denial of service. To be vulnerable, the BIND server must allow recursive queries and have at least two RPZ zones configured: one with the default setting of \"recursive-only yes\", and the other with \"recursive-only no\".\nThis issue affects BIND 9 versions 9.16.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1."}, {"lang": "es", "value": "Un servidor BIND recursivo que recibe una consulta con recursi\u00f3n deseada (RD=1) seguida de una consulta no recursiva (RD=0) puede terminar con un fallo de aserci\u00f3n, lo que resulta en una denegaci\u00f3n de servicio. Para ser vulnerable, el servidor BIND debe permitir consultas recursivas y tener configuradas al menos dos zonas RPZ: una con la configuraci\u00f3n predeterminada de \u2019recursive-only yes\u2019 y la otra con \u2019recursive-only no\u2019.\\n\\nEste problema afecta a BIND 9 en las versiones desde la 9.16.0 hasta la 9.18.50 incluida, desde la 9.20.0 hasta la 9.20.29 incluida, desde la 9.21.0 hasta la 9.21.26 incluida, desde la 9.11.3?S1 hasta la 9.18.50?S1 incluida, y desde la 9.20.9?S1 hasta la 9.20.29?S1 incluida."}], "id": "CVE-2026-97313", "lastModified": "2026-10-26T21:10:00.170", "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-officer@isc.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-97313", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-21T15:18:26.657640Z", "version": "2.0.3"}}]}, "published": "2026-10-21T13:21:09.270", "references": [{"source": "security-officer@isc.org", "url": "https://downloads.isc.org/isc/bind9/9.20.30"}, {"source": "security-officer@isc.org", "url": "https://downloads.isc.org/isc/bind9/9.21.27"}, {"source": "security-officer@isc.org", "url": "https://kb.isc.org/docs/cve-2026-97313"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "security-officer@isc.org", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2026:87309", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "bind-main-9.20.30-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-21T00:00:00Z"}], "bugzilla": {"description": "bind: bind: Denial of service via assertion failure in RPZ query processing", "id": "2556415", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556415"}, "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": "verified"}, "cwe": "CWE-617", "details": ["A flaw was found in BIND. A remote attacker can cause a denial of service (DoS) by sending a sequence of recursive and non-recursive queries to an affected server. When BIND is configured to handle recursive queries alongside multiple Response Policy Zones (RPZ) with differing recursion settings, processing these queries triggers an assertion failure. This failure causes the service to crash and terminate abruptly."], "mitigation": {"lang": "en:us", "value": "Ensure all Response Policy Zones (RPZ) configured in `/etc/named.conf` use identical `recursive-only` settings. For example, ensure all RPZ definitions consistently specify `recursive-only yes;` or `recursive-only no;`, eliminating conflicting policies.\nAlternatively, limit recursive query privileges strictly to authorized clients by configuring the `allow-recursion` option with an access control list (ACL).\nAfter modifying the configuration, validate the syntax and reload the service:\n```\nnamed-checkconf\nsystemctl reload named\n```\nCaveats:\nAligning the `recursive-only` setting across RPZ zones may alter policy enforcement behavior for non-recursive queries. Restricting recursion prevents unauthorized networks from performing recursive lookups.\nWarning:\nReloading or restarting the `named` service may cause a momentary pause in active DNS query processing."}, "name": "CVE-2026-97313", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "bind9.16", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "bind9.18", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97313\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97313\nhttps://kb.isc.org/docs/cve-2026-97313"], "statement": "Red Hat rates this vulnerability as Important because an unauthenticated remote attacker can crash the BIND name service, causing a denial of service for all dependent infrastructure. Exploitation requires a specific, non-default deployment where recursive queries are permitted alongside multiple response policy zones configured with conflicting recursive-only options. Default Red Hat Enterprise Linux configurations do not define response policy zones and are therefore not exposed unless administrators have explicitly implemented this combination of policies.", "threat_severity": "Important"}

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