Login Request a demo
Medium severity · published Jul 21, 2026
CVE-2026-63263
Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Exponential Data Expansion (CAPEC-197). An authenticated user may submit a specially crafted query to the ES|QL engine that causes exponential CPU consumption during query evaluation. Because the resource exhaustion persists beyond query completion, repeated requests can fully exhaust the available query worker resources, rendering ES|QL queries unavailable until the node is restarted.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Elasticsearch · Elastic
9.4.0 through 9.4.3; 9.0.0 through 9.3.7; 8.0.0 through 8.19.18 · source: vendor, NVD
Affected product
EL
Elasticsearch
Elastic
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63263
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63263
Vendor Advisory
https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-74/388577
More from Elasticsearch
9.8
CVE-2015-1427
The Groovy scripting engine in Elasticsearch before 1.3.8 and 1.4.x before 1.4.3 allows remote attackers to bypass the sandbox protection mechanism and execute arbitrary shell…
8.1
CVE-2014-3120
The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which allows remote attackers to execute arbitrary MVEL expressions and Java code via the source…
9.8
CVE-2015-5377
Elasticsearch before 1.6.1 allows remote attackers to execute arbitrary code via unspecified vectors involving the transport protocol
8.8
CVE-2026-72649
Deserialization of Untrusted Data in Elasticsearch Leading to Remote Code Execution
8.8
CVE-2026-72642
Use of Out-of-range Pointer Offset in the Elasticsearch Machine Learning Native Inference Process