CVE-2026-1519

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Alternatively, configure the BIND server as authoritative-only if recursive queries are not required. Disabling DNSSEC validation may reduce the security posture of the DNS resolver. A restart of the BIND service (`named`) is required for these changes to take effect and may temporarily interrupt DNS resolution."}], "x_generator": {"engine": "sadp-cli 1.0.0"}, "descriptions": [{"lang": "en", "value": "A flaw was found in BIND. A remote attacker could exploit this vulnerability by sending a maliciously crafted DNSSEC-validated zone to a BIND resolver. This could cause the resolver to consume excessive CPU resources, leading to a denial of service (DoS) for legitimate users."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-17T12:04:37.752Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-1519", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-25T14:55:33.427270Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-25T14:55:35.675Z"}}], "cna": {"title": "Excessive NSEC3 iterations cause high CPU load during insecure delegation validation", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "value": "ISC would like to thank Samy Medjahed/Ap4sh for bringing this vulnerability to our attention."}], "impacts": [{"descriptions": [{"lang": "en", "value": "If this issue is encountered, the resolver may experience excessive CPU consumption and a sharp decrease in the number of queries per second that it can handle."}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"status": "affected", "version": "9.11.0", "versionType": "custom", "lessThanOrEqual": "9.16.50"}, {"status": "affected", "version": "9.18.0", "versionType": "custom", "lessThanOrEqual": "9.18.46"}, {"status": "affected", "version": "9.20.0", "versionType": "custom", "lessThanOrEqual": "9.20.20"}, {"status": "affected", "version": "9.21.0", "versionType": "custom", "lessThanOrEqual": "9.21.19"}, {"status": "affected", "version": "9.11.3-S1", "versionType": "custom", "lessThanOrEqual": "9.16.50-S1"}, {"status": "affected", "version": "9.18.11-S1", "versionType": "custom", "lessThanOrEqual": "9.18.46-S1"}, {"status": "affected", "version": "9.20.9-S1", "versionType": "custom", "lessThanOrEqual": "9.20.20-S1"}], "defaultStatus": "unaffected"}], "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: 9.18.47, 9.20.21, 9.21.20, 9.18.47-S1, or 9.20.21-S1."}], "datePublic": "2026-03-25T00:00:00.000Z", "references": [{"url": "https://kb.isc.org/docs/cve-2026-1519", "name": "CVE-2026-1519", "tags": ["vendor-advisory"]}, {"url": "https://downloads.isc.org/isc/bind9/9.18.47", "tags": ["patch"]}, {"url": "https://downloads.isc.org/isc/bind9/9.20.21", "tags": ["patch"]}, {"url": "https://downloads.isc.org/isc/bind9/9.21.20", "tags": ["patch"]}], "workarounds": [{"lang": "en", "value": "This is not recommended, but disabling DNSSEC (`dnssec-validation no;`) prevents exploitation of this issue."}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. 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Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries).\nThis issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1."}, {"lang": "es", "value": "Si un resolvedor BIND est\u00e1 realizando validaci\u00f3n DNSSEC y encuentra una zona creada maliciosamente, el resolvedor puede consumir CPU excesiva. Los servidores solo autoritativos generalmente no se ven afectados, aunque hay circunstancias en las que los servidores autoritativos pueden realizar consultas recursivas (ver: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries).\nEste problema afecta a las versiones de BIND 9 9.11.0 a 9.16.50, 9.18.0 a 9.18.46, 9.20.0 a 9.20.20, 9.21.0 a 9.21.19, 9.11.3-S1 a 9.16.50-S1, 9.18.11-S1 a 9.18.46-S1, y 9.20.9-S1 a 9.20.20-S1."}], "id": "CVE-2026-1519", "lastModified": "2026-09-17T12:17:24.763", "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": 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{"bugzilla": {"description": "bind: BIND: Denial of Service via maliciously crafted DNSSEC-validated zone", "id": "2451305", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451305"}, "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-770", "details": ["A flaw was found in BIND. A remote attacker could exploit this vulnerability by sending a maliciously crafted DNSSEC-validated zone to a BIND resolver. This could cause the resolver to consume excessive CPU resources, leading to a denial of service (DoS) for legitimate users."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, disable DNSSEC validation on affected BIND resolvers. Alternatively, configure the BIND server as authoritative-only if recursive queries are not required. Disabling DNSSEC validation may reduce the security posture of the DNS resolver. A restart of the BIND service (`named`) is required for these changes to take effect and may temporarily interrupt DNS resolution."}, "name": "CVE-2026-1519", "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": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-25T13:25:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-1519\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-1519\nhttps://downloads.isc.org/isc/bind9/9.18.47\nhttps://downloads.isc.org/isc/bind9/9.20.21\nhttps://downloads.isc.org/isc/bind9/9.21.20\nhttps://kb.isc.org/docs/cve-2026-1519"], "statement": "This vulnerability is rated as Important. A flaw in BIND allows a remote attacker to cause a Denial of Service by sending a maliciously crafted DNSSEC-validated zone to a BIND resolver. Red Hat systems running BIND configured for DNSSEC validation are affected. Authoritative-only BIND servers are generally not impacted unless configured to perform recursive queries.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.11.0,9.16.50]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.0,9.18.46]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.0,9.20.20]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.21.0,9.21.19]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.11.3-S1,9.16.50-S1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.11-S1,9.18.46-S1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.9-S1,9.20.20-S1]"}}], "enrichment": {"confidence": 90.0, "confidence_source": "inferred", "scores": [{"score": 90.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "BIND 9", "source": "cna", "vendor": "ISC"}, "product": "bind", "vendor": "isc"}], "analysis": {"en": {"generated_at": "2026-03-26T03:21:21.534851+00:00", "value": {"mitigation_remediation": ["Upgrade to the patched release most closely related to your current version of BIND 9 (9.18.47, 9.20.21, 9.21.20, 9.18.47\u2011S1, or 9.20.21\u2011S1).", "If an upgrade is not immediately possible, disable DNSSEC validation with the directive dnssec\u2011validation no;.", "After applying the fix or workaround, monitor CPU usage to confirm that the vulnerability is no longer exercised."], "summary": {"action": "Patch", "impact": "Denial of Service (CPU exhaustion)"}, "threat_synthesis": {"affected_systems": "The affected product is ISC BIND 9. All releases from 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, and 9.21.0 through 9.21.19, as well as their security patch releases 9.11.3\u2011S1 through 9.16.50\u2011S1, 9.18.11\u2011S1 through 9.18.46\u2011S1, and 9.20.9\u2011S1 through 9.20.20\u2011S1 are impacted.", "description_and_impact": "The vulnerability arises when a BIND resolver that validates DNSSEC encounters a malicious zone containing an excessive number of NSEC3 iterations. The resolver spends a large amount of CPU time processing the invalid NSEC3 proofs, which can exhaust server resources and lead to denial of service. This is a classic resource exhaustion flaw, reflected by CWE\u2011770. Only resolvers with DNSSEC validation enabled are vulnerable; authoritative\u2011only servers are normally unaffected unless they perform recursive queries.", "risk_and_exploitability": "The CVSS score of 7.5 indicates a high severity. Though the EPSS score is not available and the vulnerability is not listed in the CISA KEV catalog, the high CVSS coupled with the availability of a malicious zone makes exploitation plausible. Attackers can remotely trigger the issue by making the resolver query a crafted zone while DNSSEC validation is active, causing CPU exhaustion. The community recommends upgrading to the patched releases or, as a temporary measure, disabling DNSSEC validation to mitigate the risk."}}}}, "created": "2026-03-25T21:31:14.428071+00:00", "updated": "2026-03-26T12:13:27.101880+00:00", "vendors": ["isc", "isc$PRODUCT$bind"]}