CVE-2026-115448

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The same log affects a leader and its followers, so it can spread across an ensemble.<br><br>This issue affects Apache ZooKeeper 3.8.0 through 3.8.7 and 3.9.0 through 3.9.6. Users are recommended to upgrade to 3.8.8 or 3.9.7, which fix the issue. 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{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.zookeeper:zookeeper", "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper", "product": "Apache ZooKeeper", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "3.9.6", "status": "affected", "version": "3.9.0", "versionType": "maven"}, {"lessThanOrEqual": "3.8.7", "status": "affected", "version": "3.8.0", "versionType": "maven"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Uncontrolled recursion in Apache ZooKeeper. The server serializes its data tree to a snapshot by recursing one stack frame per znode level, with no depth bound. A client permitted to create znodes (the default root ACL is open) can build a chain of nested znodes deep enough that taking a snapshot exhausts the JVM stack and kills the snapshot thread; sizes stay within jute.maxbuffer, so existing limits do not prevent it. This is a denial of service that becomes persistent: on restart the server rebuilds the deep tree from its transaction log and fails again while taking the startup snapshot, so it does not return to service, and recovery can entail data loss. The same log affects a leader and its followers, so it can spread across an ensemble.\n\nThis issue affects Apache ZooKeeper 3.8.0 through 3.8.7 and 3.9.0 through 3.9.6. Users are recommended to upgrade to 3.8.8 or 3.9.7, which fix the issue. As a workaround, use ACLs and authentication to restrict znode creation rather than relying on the default open root ACL."}], "id": "CVE-2026-115448", "lastModified": "2026-11-06T11:17:05.047", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@apache.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-115448", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-04T14:35:34.807616Z", "version": "2.0.3"}}]}, "published": "2026-11-04T11:17:14.017", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/p892jm8qw0zqv8z152lpokyt7mp6gc41"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/11/03/13"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "org.apache.zookeeper/zookeeper: ZooKeeper: Denial of Service via deeply nested znodes during snapshot creation", "id": "2566835", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2566835"}, "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 Apache ZooKeeper. A remote attacker with permission to create data nodes (znodes) can build an excessively deep hierarchy of nested nodes, triggering uncontrolled recursion when the server saves a snapshot. This condition exhausts the call stack and terminates the snapshot process, resulting in a persistent Denial of Service (DoS). Because the server reprocesses the deep node structure from transaction logs upon reboot, the failure recurs across the ensemble and prevents the service from recovering."], "mitigation": {"lang": "en:us", "value": "Restrict network exposure and enforce strict authentication and Access Control Lists (ACLs) on ZooKeeper instances:\n1. Network Isolation:\nLimit access to ZooKeeper service ports (such as TCP port 2181) strictly to trusted application infrastructure using firewalld:\n```\nfirewall-cmd --zone=trusted --add-source=<trusted-client-ip> --permanent\nfirewall-cmd --permanent --remove-port=2181/tcp\nfirewall-cmd --reload\n```\n2. Access Control Configuration:\nConfigure authentication (such as SASL or digest) and replace the default open root ACL to revoke unauthenticated creation rights on the root path using the administrative client:\n```\nsetAcl / auth:<user>:<password>:cdwra\n```\nCaveats: Applying strict ACLs and restricting network ports will block clients that rely on anonymous or unauthenticated connections until valid credentials are provided.\nWarning: Reloading firewall rules or modifying ZooKeeper configuration parameters may cause transient service interruptions or require restarting dependent cluster components."}, "name": "CVE-2026-115448", "package_state": [{"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Affected", "package_name": "zookeeper", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Fix deferred", "package_name": "zookeeper", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:offline_knowledge_portal:1", "fix_state": "Affected", "package_name": "offline-knowledge-portal/rhokp-rhel9", "product_name": "Red Hat Offline Knowledge Portal"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-modelmesh-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-spark-operator-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cpu-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cpu-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cuda130-torch210-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-cuda130-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th06-rocm64-torch291-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th-torch-cpu-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Affected", "package_name": "rhoai/odh-th-torch-cuda-py312-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-11-04T10:45:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-115448\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-115448\nhttps://lists.apache.org/thread.html/p892jm8qw0zqv8z152lpokyt7mp6gc41"], "statement": "Red Hat rates this flaw with an Important severity because an untrusted network client with write permissions can induce an unrecoverable denial of service across an entire cluster, persisting across daemon restarts. In typical Red Hat deployments, ZooKeeper instances are maintained within isolated internal networks, which restricts direct reachability from untrusted endpoints. However, if default permissive access permissions on root paths are preserved, any permitted client can construct deeply nested node hierarchies that exhaust the call stack during state serialization, causing cluster-wide failure and impeding recovery.", "threat_severity": "Important"}

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