CVE-2026-42399
Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
6.5
MEDIUM
CVSS 3.1
EPSS 0.05%
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.
How to fix CVE-2026-42399
To remediate CVE-2026-42399, upgrade the affected package to a fixed version below.
- —upgrade to 8.19.16 or later
- —upgrade to 8.19.16 or later
Is CVE-2026-42399 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 8.0.0, < 8.19.16, >= 9.0.0, < 9.3.5
- >= 8.0.0, < 8.19.16, >= 9.0.0, < 9.3.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |