CVE-2026-3039

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Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments.\nThis issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1."}], "impacts": [{"descriptions": [{"lang": "en", "value": "An attacker can construct and send packets to a BIND server that will cause it to allocate memory that is not subsequently released. 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A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server."}], "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": "2026-09-10T12:04:48.031Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-3039", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-20T13:42:49.621351Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-20T13:42:57.276Z"}}], "cna": {"title": "BIND 9 server memory exhaustion during GSS-API TKEY negotiation", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "value": "ISC would like to thank Vitaly Simonovich for bringing this vulnerability to our attention."}], "impacts": [{"descriptions": [{"lang": "en", "value": "An attacker can construct and send packets to a BIND server that will cause it to allocate memory that is not subsequently released. 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Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments.\nThis issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1."}, {"lang": "es", "value": "Los servidores BIND que est\u00e1n configurados para usar autenticaci\u00f3n basada en TKEY a trav\u00e9s de tokens GSS-API son vulnerables al consumo excesivo de memoria al recibir y procesar paquetes construidos maliciosamente. T\u00edpicamente, estos servidores se encontrar\u00e1n en implementaciones DNS integradas con Active Directory y/o entornos DNS protegidos con Kerberos.\nEste problema afecta a las versiones de BIND 9 9.0.0 a 9.16.50, 9.18.0 a 9.18.48, 9.20.0 a 9.20.22, 9.21.0 a 9.21.21, 9.9.3-S1 a 9.16.50-S1, 9.18.11-S1 a 9.18.48-S1, y 9.20.9-S1 a 9.20.22-S1."}], "id": "CVE-2026-3039", "lastModified": "2026-09-17T12:18:14.290", "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"}, {"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": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3039", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-20T13:42:49.621351Z", "version": "2.0.3"}}]}, "published": "2026-05-20T13:16:23.647", "references": [{"source": "security-officer@isc.org", "tags": ["Patch"], "url": "https://downloads.isc.org/isc/bind9/9.18.49"}, {"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-2026-3039"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:20334"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:23360"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:24338"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:24339"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:24367"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:24368"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:55441"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:57189"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:60383"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:62549"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:65851"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-3039"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479767"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3039.json"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-771"}], "source": "security-officer@isc.org", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-770"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2026:20334", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "bind-main-9.18.49-1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-05-21T00:00:00Z"}], "bugzilla": {"description": "bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation", "id": "2479767", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479767"}, "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-770", "details": ["A flaw was found in BIND. A remote attacker can exploit this vulnerability by sending maliciously-constructed packets to BIND servers configured for TKEY-based authentication via GSS-API (Generic Security Service Application Program Interface) tokens. This can lead to excessive memory consumption, resulting in a Denial of Service (DoS) for the affected server."], "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.\nExample:\n```bash\n# Edit /etc/named.conf and remove or comment out lines related to tkey-gssapi-keytab or tkey-gssapi-credential.\n# For example, remove or comment out:\n# key \"gssapi-key\" {\n# algorithm GSSAPI;\n# secret \"BASE64_ENCODED_KEY\";\n# };\n#\n# Then reload the named service:\nsystemctl reload named\n```\nReloading the `named` service may cause a brief interruption in DNS resolution."}, "name": "CVE-2026-3039", "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": "2026-05-21T12:24:11Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-3039\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-3039"], "statement": "Important: BIND servers configured for TKEY-based GSS-API authentication are vulnerable to memory exhaustion when processing maliciously-constructed packets. This can lead to a denial of service, specifically impacting Red Hat deployments integrated with Active Directory or Kerberos for DNS where this authentication method is enabled.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.16.50]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.0,9.18.48]"}}, {"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": "[9.9.3-S1,9.16.50-S1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.18.11-S1,9.18.48-S1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.20.9-S1,9.20.22-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": "2026-05-20T14:45:32.460888+00:00", "updated": "2026-10-07T08:30:15.854178+00:00", "vendors": ["isc", "isc$PRODUCT$bind"]}