CVE-2026-42397 Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Service
An authenticated user can cause a denial of service in Kibana by submitting oversized inputs to Entity Analytics endpoints, exhausting resources.
- 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-2026-42397?
CVE-2026-42397 is a medium-severity denial of service vulnerability in Elastic Kibana, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Allocation of Resources Without Limits or Throttling (CWE-770) in Kibana can lead to a denial of service via Excessive Allocation (CAPEC-130). An authenticated user can submit a specially crafted request to affected Entity Analytics endpoints containing an oversized input value that causes excessive resource consumption, which may render Kibana unavailable.
Weakness: CWE-770
Which versions are affected by CVE-2026-42397?
2 open source packages ship an affected version, including kibana and elk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
kibana Bitnami | From 9.3.0 | 9.3.7, 9.4.4 |
elk Bitnami | From 9.3.0 | 9.3.7, 9.4.4 |
Products include Elastic Kibana.
How do I fix CVE-2026-42397?
Upgrade kibana to a fixed version for your release line: 9.3.7 or 9.4.4.
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-2026-42397 being exploited?
There is no known exploitation of CVE-2026-42397 in the wild and no public exploit code.
Other vulnerabilities in Elastic Kibana
Sources
Also known as BIT-elk-2026-42397, BIT-kibana-2026-42397, GHSA-jpjg-2w23-5jgr, MINI-5hvc-fjrh-h82q, MINI-p9wh-x2hm-7gxg.