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Medium severity · published Jul 21, 2026
CVE-2026-63136
Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). A user with search privileges can submit a specially crafted search request that causes a data node to exhaust available heap memory, resulting in node unavailability and cluster degradation. An attacker could leverage this vulnerability to cause cluster downtime requiring manual intervention to restore service.
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)0.4% · higher than 36% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Elasticsearch · Elastic
8.0.0 through 8.19.14; 9.3.0 through 9.3.3; 9.0.0 through 9.2.8 · source: vendor, NVD
Affected product
EL
Elasticsearch
Elastic
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63136
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63136
Vendor Advisory
https://discuss.elastic.co/t/elasticsearch-8-19-15-9-2-9-9-3-4-security-update-esa-2026-60/388559
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