What’s Vulnerable › Vulnerabilities
CVE-2026-42400: Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-28 · updated 2026-10-14
- Weakness: CWE-400
Description
Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can result in a Kibana instance becoming unresponsive or crashing.
Affected products
- Kibana: from 8.0.0 before 8.19.16; from 9.0.0 before 9.3.5; from 9.4.0 before 9.4.2 — fixed in 8.19.16, 9.3.5, 9.4.2
How to fix
Upgrade to a fixed version: Kibana 8.19.16, 9.3.5, 9.4.2. Check the vendor advisory for mitigations.
References
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