CVE-2026-42400 Uncontrolled Resource Consumption in Kibana Leading to Denial of Service
An authenticated user can cause a Kibana denial of service by sending crafted compressed requests that trigger excessive resource consumption before authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42400?
CVE-2026-42400 is a medium-severity denial of service vulnerability in Elastic Kibana, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2026-42400?
2 open source packages ship an affected version, including kibana and elk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
kibana Bitnami | From 8.0.0 | 8.19.16, 9.3.5, 9.4.2 |
elk Bitnami | From 8.0.0 | 8.19.16, 9.3.5, 9.4.2 |
Products include Elastic Kibana.
How do I fix CVE-2026-42400?
Upgrade kibana to a fixed version for your release line: 8.19.16, 9.3.5 or 9.4.2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-42400 being exploited?
There is no known exploitation of CVE-2026-42400 in the wild and no public exploit code.
Other vulnerabilities in Elastic Kibana
Sources
Also known as BIT-elk-2026-42400, BIT-kibana-2026-42400, GHSA-mhgf-jqhm-p7p3, MINI-2c7w-47j9-hx8m, MINI-5hp2-x3v9-85fj, MINI-7266-6vv7-59jw and 4 more.