CVE-2026-26935 Improper Input Validation in Kibana Leading to Denial of Service

What is CVE-2026-26935?

CVE-2026-26935 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 Input Validation (CWE-20) in the internal Content Connectors search endpoint in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)

Weakness: CWE-20

Which versions are affected by CVE-2026-26935?

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-2026-26935?

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-2026-26935 being exploited?

There is no known exploitation of CVE-2026-26935 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-2026-26935, BIT-kibana-2026-26935, GHSA-5rmp-wvrc-g6g5, MINI-6555-q25x-799j, MINI-6x7f-7pf9-7cfx, MINI-9vxg-5gcp-945c and 3 more.