What’s Vulnerable › Vulnerabilities
CVE-2026-42399: 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 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.
Affected products
- Kibana: from 8.0.0 before 8.19.16; from 9.0.0 before 9.3.5 — fixed in 8.19.16, 9.3.5
How to fix
Upgrade to a fixed version: Kibana 8.19.16, 9.3.5. Check the vendor advisory for mitigations.
References
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