CVE-2026-3593

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"vendor": "Red Hat"}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:openshift:4"], "defaultStatus": "unaffected", "packageName": "openshift/ose-rhel-coreos-9", "product": "Red Hat OpenShift Container Platform 4", "vendor": "Red Hat"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "matchCriteriaId": "D92461F1-BA01-479E-B740-38855CC216E6", "versionEndExcluding": "9.20.23", "versionStartIncluding": "9.20.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "matchCriteriaId": "B254E8E7-3F57-4552-ACBF-623FA481B697", "versionEndExcluding": "9.21.22", "versionStartIncluding": "9.21.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A use-after-free vulnerability exists within the DNS-over-HTTPS implementation.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1.\nBIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected."}, {"lang": "es", "value": "Una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n existe dentro de la implementaci\u00f3n de DNS-over-HTTPS.\nEste problema afecta a las versiones de BIND 9 9.20.0 a 9.20.22, 9.21.0 a 9.21.21, y 9.20.9-S1 a 9.20.22-S1.\nLas versiones de BIND 9 9.18.0 a 9.18.48 y 9.18.11-S1 a 9.18.48-S1 NO est\u00e1n afectadas."}], "id": "CVE-2026-3593", "lastModified": "2026-08-24T13:18:29.853", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "security-officer@isc.org", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3593", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-20T13:40:34.896109Z", "version": "2.0.3"}}]}, "published": "2026-05-20T13:16:23.923", "references": [{"source": "security-officer@isc.org", "tags": ["Patch"], "url": "https://downloads.isc.org/isc/bind9/9.20.23"}, {"source": "security-officer@isc.org", "tags": ["Patch"], "url": "https://downloads.isc.org/isc/bind9/9.21.22"}, {"source": "security-officer@isc.org", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2026-3593"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:7412"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-3593"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479770"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3593.json"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security-officer@isc.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-825"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation", "id": "2479770", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479770"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the BIND (Berkeley Internet Name Domain) DNS-over-HTTPS implementation. A remote attacker could send specially crafted HTTP/2 traffic to a DNS-over-HTTPS endpoint, leading to a use-after-free vulnerability. This could trigger memory corruption, potentially allowing the attacker to cause a denial of service or, in some cases, execute arbitrary code."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-3593", "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:hummingbird:1", "fix_state": "Affected", "package_name": "bind", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-05-21T11:59:02Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-3593\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-3593"], "statement": "Important: A heap use-after-free vulnerability in BIND's DNS-over-HTTPS implementation allows a remote attacker to trigger memory corruption by sending crafted HTTP/2 traffic to a DNS-over-HTTPS endpoint. This affects both authoritative servers and resolvers configured to use DNS-over-HTTPS, potentially leading to denial of service or other impacts.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.0,9.20.22]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.21.0,9.21.21]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.9-S1,9.20.22-S1]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[9.18.0,9.18.48]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[9.18.11-S1,9.18.48-S1]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "BIND 9", "source": "cna", "vendor": "ISC"}, "product": "bind", "vendor": "isc"}], "created": "2026-05-20T14:45:32.459318+00:00", "updated": "2026-06-18T08:00:16.453174+00:00", "vendors": ["isc", "isc$PRODUCT$bind"]}