CVE-2026-26934 Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service

What is CVE-2026-26934?

CVE-2026-26934 is a medium-severity denial of service vulnerability in Elastic Kibana, published on 26 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper Validation of Specified Quantity in Input (CWE-1284) in Kibana can allow an authenticated attacker with view-only privileges to cause a Denial of Service via Input Data Manipulation (CAPEC-153). An attacker can send a specially crafted, malformed payload causing excessive resource consumption and resulting in Kibana becoming unresponsive or crashing.

Weakness: CWE-1284

Which versions are affected by CVE-2026-26934?

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-2026-26934?

Upgrade kibana to a fixed version for your release line: 8.19.12, 9.2.6 or 9.3.1.

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-2026-26934 being exploited?

There is no known exploitation of CVE-2026-26934 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-2026-26934, BIT-kibana-2026-26934, GHSA-vvxg-3v44-fpqx, MINI-3qcg-xq36-4774, MINI-6mc8-hv7j-9834, MINI-73gx-hch3-mpvx and 3 more.