CVE-2026-63261 Uncontrolled Resource Consumption in Kibana Leading to Denial of Service

What is CVE-2026-63261?

CVE-2026-63261 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

Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). A low-privileged authenticated user can send a specially crafted request to a Kibana machine learning feature, causing the server to exhaust available memory and become unavailable to all users.

Weakness: CWE-400

Which versions are affected by CVE-2026-63261?

2 open source packages ship an affected version, including kibana and elk. It affects 1 product.

Products include Elastic Kibana.

How do I fix CVE-2026-63261?

Upgrade kibana to a fixed version for your release line: 8.19.19, 9.3.8 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-2026-63261 being exploited?

There is no known exploitation of CVE-2026-63261 in the wild and no public exploit code.

Other vulnerabilities in Elastic Kibana

• CVE-2019-7609 Kibana Arbitrary Code Execution Exploited Critical 9.8
• CVE-2025-25015 Kibana arbitrary code execution via prototype pollution Critical 9.9
• CVE-2024-37288 Deserialization in Kibana Critical 9.9
• CVE-2023-31415 Code injection in Kibana Critical 9.9
• CVE-2018-17245 Information disclosure in Kibana Critical 9.8

All Elastic Kibana vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-elk-2026-63261, BIT-kibana-2026-63261, GHSA-95j6-2ch4-858w, MINI-952v-p5w3-jj3j, MINI-c7p8-5m4p-fcj8, MINI-h2pv-65m6-jgw2 and 4 more.