Vulnerability Details CVE-2026-72678
Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 21.1%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-72678
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cpe:2.3:a:elastic:elasticsearch:8.19.0
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cpe:2.3:a:elastic:elasticsearch:8.19.1
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cpe:2.3:a:elastic:elasticsearch:8.19.10
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cpe:2.3:a:elastic:elasticsearch:8.19.11
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cpe:2.3:a:elastic:elasticsearch:8.19.12
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cpe:2.3:a:elastic:elasticsearch:8.19.13
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cpe:2.3:a:elastic:elasticsearch:8.19.14
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cpe:2.3:a:elastic:elasticsearch:8.19.15
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cpe:2.3:a:elastic:elasticsearch:8.19.16
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cpe:2.3:a:elastic:elasticsearch:8.19.17
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cpe:2.3:a:elastic:elasticsearch:8.19.18
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cpe:2.3:a:elastic:elasticsearch:8.19.19
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cpe:2.3:a:elastic:elasticsearch:8.19.2
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cpe:2.3:a:elastic:elasticsearch:8.19.3
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cpe:2.3:a:elastic:elasticsearch:8.19.4
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cpe:2.3:a:elastic:elasticsearch:8.19.5
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cpe:2.3:a:elastic:elasticsearch:8.19.6
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cpe:2.3:a:elastic:elasticsearch:8.19.7
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cpe:2.3:a:elastic:elasticsearch:8.19.8
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cpe:2.3:a:elastic:elasticsearch:8.19.9
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cpe:2.3:a:elastic:elasticsearch:9.5.0