Medium severity · published May 28, 2026
CVE-2026-42399
Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated low-privileged user can cause Kibana to consume exponentially increasing amounts of memory by submitting a specially crafted Timelion visualization expression containing deeply chained function calls. The resulting data structure grows without bound, exhausting available memory and causing the Kibana service to crash and become unavailable to all users.
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 26% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KI
Kibana · Elastic
8.0.0 through 8.19.15; 9.0.0 through 9.3.4 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42399
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42399
Vendor Advisory
https://discuss.elastic.co/t/kibana-8-19-16-and-9-3-5-security-update-esa-2026-36/386556
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