Vulnerability Details CVE-2026-63144
Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via a specially crafted search request submitted by a low-privileged authenticated user. A user with read-level index access can submit a request that triggers unbounded recursive processing within the Elasticsearch query evaluation component, causing a fatal error that terminates the affected node. In single-node deployments, this results in complete service outage; in multi-node clusters, it causes repeated node restarts and sustained availability degradation.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.6%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-63144
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cpe:2.3:a:elastic:elasticsearch:9.3.0
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cpe:2.3:a:elastic:elasticsearch:9.3.1
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cpe:2.3:a:elastic:elasticsearch:9.3.2
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cpe:2.3:a:elastic:elasticsearch:9.3.3
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cpe:2.3:a:elastic:elasticsearch:9.3.4
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cpe:2.3:a:elastic:elasticsearch:9.3.5
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cpe:2.3:a:elastic:elasticsearch:9.3.6
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cpe:2.3:a:elastic:elasticsearch:9.3.7