CVE-2026-9064

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The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service."}], "affected": [{"versions": [{"status": "affected", "version": "0"}], "packageName": "389-ds-base", "collectionURL": "https://github.com/389ds/389-ds-base"}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 11.5 E4S for RHEL 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:11", "defaultStatus": "affected", "versions": [{"version": "8060020260609102432.0ca98e7e", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:directory_server_e4s:11.5::el8"]}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 11.7 E4S for RHEL 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:11", "defaultStatus": "affected", "versions": [{"version": 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This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. 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The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad en 389-ds-base. La funci\u00f3n get_ldapmessage_controls_ext() en el servidor LDAP no impone un l\u00edmite superior en el n\u00famero de controles por mensaje LDAP. Un atacante remoto no autenticado puede enviar una solicitud LDAP especialmente dise\u00f1ada que contiene cientos de miles de controles m\u00ednimos dentro del tama\u00f1o m\u00e1ximo predeterminado del mensaje BER (2 MB), causando un consumo excesivo de CPU y asignaci\u00f3n de memoria heap en el servidor. Bajo explotaci\u00f3n concurrente, esto lleva a una degradaci\u00f3n significativa de la latencia, agotamiento de los hilos de trabajo o terminaci\u00f3n por falta de memoria, lo que resulta en una denegaci\u00f3n de servicio."}], "id": "CVE-2026-9064", "lastModified": "2026-11-05T01:17:25.933", "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": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", 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{"acknowledgement": "Red Hat would like to thank Oleh Konko (1seal.org) for reporting this issue.", "bugzilla": {"description": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)", "id": "2480093", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480093"}, "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 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service."], "mitigation": {"lang": "en:us", "value": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads."}, "name": "CVE-2026-9064", "package_state": [{"cpe": "cpe:/a:redhat:directory_server:11", "fix_state": "Affected", "package_name": "redhat-ds:11/389-ds-base", "product_name": "Red Hat Directory Server 11"}, {"cpe": "cpe:/a:redhat:directory_server:12", "fix_state": "Affected", "package_name": "redhat-ds:12/389-ds-base", "product_name": "Red Hat Directory Server 12"}, {"cpe": "cpe:/a:redhat:directory_server:13", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Directory Server 13"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "389-ds:1.4/389-ds-base", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-20T07:30:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-9064\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-9064"], "statement": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "Red Hat Enterprise Linux 10", "source": "cna", "vendor": "Red Hat"}, "product": "enterprise_linux", "vendor": "redhat"}, {"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 92.0, "confidence_source": "matching", "scores": [{"score": 92.0, "source": "matching"}]}, "original": {"product": "Red Hat Directory Server 11", "source": "cna", "vendor": "Red Hat"}, "product": "redhat_directory_server", "vendor": "redhat"}], "created": "2026-05-20T11:30:26.140481+00:00", "updated": "2026-05-21T08:19:26.053081+00:00", "vendors": ["redhat", "redhat$PRODUCT$enterprise_linux", "redhat$PRODUCT$redhat_directory_server"]}