Medium severity · published Oct 6, 2026
CVE-2026-102409
Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Uncontrolled Recursion (CWE-674) in Elasticsearch can allow an authenticated user with low privileges to terminate an Elasticsearch node, resulting in denial of service, via Excessive Allocation (CAPEC-130).
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)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Elasticsearch · Elastic
9.2.0 through 9.2.8; 9.3.0 through 9.3.8; 9.4.0 through 9.4.7; 9.5.0 through 9.5.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-102409
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-102409
discuss.elastic.co
https://discuss.elastic.co/t/elasticsearch-9-4-8-9-5-5-security-update-esa-2026-190/390863
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