CVE-2026-0531

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{"bugzilla": {"description": "kibana: allocation of resources without limits or throttling via specially crafted bulk retrieval request", "id": "2429392", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429392"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana Fleet can lead to Excessive Allocation (CAPEC-130) via a specially crafted bulk retrieval request. This requires an attacker to have low-level privileges equivalent to the viewer role, which grants read access to agent policies. The crafted request can cause the application to perform redundant database retrieval operations that immediately consume memory until the server crashes and becomes unavailable to all users.", "A flaw was found in Kibana. An attacker with low-level privileges equivalent to the viewer role, can exploit this vulnerability by sending a specially crafted bulk retrieval request. This request can trigger redundant database operations, causing the application to consume excessive memory, eventually resulting in a denial of service."], "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-2026-0531", "package_state": [{"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/kibana6-rhel8", "product_name": "Logging Subsystem for Red Hat OpenShift"}], "public_date": "2026-01-13T21:05:51Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0531\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0531\nhttps://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-04/384522"], "statement": "This issue allows a remote attacker with low-level privileges equivalent to the viewer role, which grants read access to agent policies, to cause an excessive allocation of resources by sending specially crafted bulk retrieval requests, eventually resulting in a denial of service. As the attacker must have low-level privileges to exploit this issue, this vulnerability has been rated with a moderate severity.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T06:26:38.299293+00:00", "value": {"mitigation_remediation": ["Upgrade Kibana to the latest version following Elastic\u2019s security release advisory.", "Restrict viewer\u2011role users from accessing Fleet bulk retrieval endpoints, or enforce stricter role permissions to disable read access to agent policies.", "Implement application\u2011level rate limiting or resource throttling to prevent exhaustion of memory during bulk operations."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service via memory exhaustion"}, "threat_synthesis": {"affected_systems": "Elastic Kibana is the affected product. No specific version information is listed, so any installation of Kibana that includes Fleet is potentially vulnerable. Users should verify their deployments against vendor advisories.", "description_and_impact": "The vulnerability present in Kibana Fleet allows a specially crafted bulk retrieval request to trigger redundant database retrieval operations that consume memory until the server crashes. An attacker with a viewer\u2011level role\u2014which provides read access to agent policies\u2014can exploit this flaw. The resulting denial of service makes Kibana unavailable to all users.", "risk_and_exploitability": "The CVSS base score of 6.5 indicates moderate severity, while an EPSS of less than 1% reflects a low likelihood of broad exploitation. The flaw is not yet catalogued in CISA\u2019s KEV list. Exploitation requires a viewer\u2011level account and the ability to send the crafted bulk request, suggesting the attack vector is likely internal or via compromised credentials rather than remote network intrusion. Given the moderate impact and low exploitation probability, the risk is considered moderate, warranting timely patching."}}}}, "created": "2026-01-14T11:08:29.767262+00:00", "updated": "2026-04-18T06:30:25.910664+00:00", "vendors": ["elastic", "elastic$PRODUCT$kibana"]}