CVE-2026-42399: Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42399?
The severity of CVE-2026-42399 is rated medium with a score of 6.5.
What does CVE-2026-42399 affect?
CVE-2026-42399 affects the Elastic Kibana software.
How can CVE-2026-42399 be exploited?
CVE-2026-42399 can be exploited by an authenticated low-privileged user submitting a specially crafted Timelion visualization expression.
What are the potential consequences of CVE-2026-42399?
CVE-2026-42399 can lead to denial of service due to uncontrolled resource consumption.
How do I fix CVE-2026-42399?
To fix CVE-2026-42399, update to the latest version of Kibana provided by Elastic.