CVE-2026-26937
Published: 26 February 2026
Summary
CVE-2026-26937 is a medium-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Elastic Kibana. Its CVSS base score is 6.5 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application Exhaustion Flood (T1499.003); ranked at the 20.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.
Analysis identifies uncontrolled resource consumption indicative of denial-of-service or abuse attempts.
Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.
Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.
Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.
Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.
The team can analyze and respond to resource exhaustion incidents, reducing the impact of attacks that exploit uncontrolled consumption weaknesses.
Timely maintenance support and spare parts enable rapid recovery from failures induced by uncontrolled resource consumption, shortening the impact window of denial-of-service attacks.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Uncontrolled resource consumption (CWE-400) via crafted input in Kibana Timelion directly enables application-layer resource exhaustion DoS by an authenticated network attacker.
NVD Description
Uncontrolled Resource Consumption (CWE-400) in the Timelion component in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)
Deeper analysisAI
CVE-2026-26937 is an uncontrolled resource consumption vulnerability (CWE-400) affecting the Timelion component in Kibana. Published on 2026-02-26, it enables denial of service through input data manipulation (CAPEC-153). The issue carries a CVSS v3.1 base score of 6.5 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
An attacker requires low privileges to exploit this vulnerability over the network with low attack complexity and no user interaction. Successful exploitation results in high-impact denial of service via resource exhaustion, with no effects on confidentiality or integrity.
Elastic's security advisory ESA-2026-15, available at https://discuss.elastic.co/t/kibana-8-19-11-9-2-5-security-update-esa-2026-15/385251, addresses the vulnerability with updates for Kibana versions including 8.19.1 and 9.2.5.
Details
- CWE(s)