Medium severity · published Mar 19, 2026
CVE-2026-26940
Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
Improper Validation of Specified Quantity in Input (CWE-1284) in the Timelion visualization plugin in Kibana can lead Denial of Service via Excessive Allocation (CAPEC-130). The vulnerability allows an authenticated user to send a specially crafted Timelion expression that overwrites internal series data properties with an excessively large quantity value.
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 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KI
Kibana · Elastic
9.3.0 through 9.3.1; 9.0.0 through 9.2.6; 8.0.0 through 8.19.12 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26940
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26940
Vendor Advisory
https://discuss.elastic.co/t/kibana-8-19-13-9-2-7-9-3-2-security-update-esa-2026-20/385535
More from Kibana
10.0
CVE-2019-7609
Kibana Arbitrary Code Execution
9.9
CVE-2025-25015
Prototype pollution in Kibana leads to arbitrary code execution via a crafted file upload and specifically crafted HTTP requests
9.8
CVE-2025-25014
A Prototype pollution vulnerability in Kibana leads to arbitrary code execution via crafted HTTP requests to machine learning and reporting endpoints
9.8
CVE-2024-12556
Prototype Pollution in Kibana can lead to code injection via unrestricted file upload combined with path traversal
9.8
CVE-2018-17246
Kibana versions before 6.4.3 and 5.6.13 contain an arbitrary file inclusion flaw in the Console plugin