{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-19662", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "state": "PUBLISHED", "assignerShortName": "isc", "dateReserved": "2026-08-12T20:13:09.206Z", "datePublished": "2026-09-16T13:50:10.432Z", "dateUpdated": "2026-09-17T18:45:11.717Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2026-09-16T13:50:10.432Z"}, "title": "qpcache NOQNAME proof use-after-free crashes recursive resolver", "datePublic": "2026-09-16T00:00:00.000Z", "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"version": "9.11.0", "lessThanOrEqual": "9.18.50", "status": "affected", "versionType": "custom"}, {"version": "9.20.0", "lessThanOrEqual": "9.20.27", "status": "affected", "versionType": "custom"}, {"version": "9.11.3-S1", "lessThanOrEqual": "9.18.50-S1", "status": "affected", "versionType": "custom"}, {"version": "9.20.9-S1", "lessThanOrEqual": "9.20.27-S1", "status": "affected", "versionType": "custom"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.11.0", "versionEndIncluding": "9.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.20.0", "versionEndIncluding": "9.20.27"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.11.3-S1", "versionEndIncluding": "9.18.50-S1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.20.9-S1", "versionEndIncluding": "9.20.27-S1"}]}]}], "metrics": [{"cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.9, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free"}]}], "descriptions": [{"lang": "en", "value": "An attacker may be able to cause a `named` resolver to abort. The attack requires inducing the victim resolver to send multiple queries for a DNSSEC-signed zone hosted by an authoritative server under the control of the attacker. If the auth responds with a particular sequence of crafted answers, and those answers arrive in a particular order with particular timing, the `named` resolver will encounter a use-after-free bug, and abort.\nThis issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1."}], "impacts": [{"descriptions": [{"lang": "en", "value": "A successful attack may result in unexpected program exit and a denial-of-service."}]}], "workarounds": [{"lang": "en", "value": "No workarounds known."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.29 or 9.20.29-S1."}], "credits": [{"lang": "en", "value": "ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention."}], "references": [{"url": "https://kb.isc.org/docs/cve-2026-19662", "name": "CVE-2026-19662", "tags": ["vendor-advisory"]}, {"url": "https://downloads.isc.org/isc/bind9/9.20.29", "tags": ["patch"]}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-17T18:44:50.752130Z", "id": "CVE-2026-19662", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-17T18:45:11.717Z"}}]}}

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{"bugzilla": {"description": "bind9: bind: BIND 9: Denial of Service via crafted DNSSEC responses", "id": "2535445", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535445"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in BIND 9. A remote attacker can cause a `named` resolver to stop functioning (Denial of Service) by inducing the victim resolver to send multiple queries for a DNSSEC-signed zone. If the attacker's authoritative server responds with a specific sequence of crafted answers that arrive with particular timing, a use-after-free vulnerability is triggered, leading to the resolver's abortion."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, consider disabling DNSSEC validation on `named` resolvers if it is not a strict requirement for your environment. This can be achieved by setting `dnssec-validation no;` in the `named.conf` file. Disabling DNSSEC validation will prevent the resolver from processing DNSSEC-signed zones, thereby avoiding this specific vulnerability, but it will also remove the security benefits provided by DNSSEC. After modifying the configuration, the `named` service must be reloaded or restarted for the changes to take effect.\n`sudo systemctl reload named`\n`sudo systemctl restart named`"}, "name": "CVE-2026-19662", "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": "Under investigation", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Under investigation", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-16T13:50:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-19662\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-19662\nhttps://downloads.isc.org/isc/bind9/9.20.29\nhttps://kb.isc.org/docs/cve-2026-19662"], "statement": "This Moderate impact denial of service vulnerability in BIND 9's `named` resolver can lead to service unavailability. Exploitation requires an attacker to operate an authoritative DNS server and specifically induce a vulnerable resolver to query it for a DNSSEC-signed zone. The attack relies on a precise sequence and timing of crafted DNSSEC responses, limiting its broader applicability.", "threat_severity": "Moderate"}

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