CVE-2026-26936 Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service
Attackers can cause denial of service in Kibana's AI Inference Anonymization Engine via inefficient regular expressions causing exponential blowup.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26936?
CVE-2026-26936 is a medium-severity denial of service vulnerability in Elastic Kibana, published on 26 Feb 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).
Weakness: CWE-1333
Which versions are affected by CVE-2026-26936?
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 | 8.19.11, 9.2.5 |
elk Bitnami | From 8.0.0 | 8.19.11, 9.2.5 |
Products include Elastic Kibana.
How do I fix CVE-2026-26936?
Upgrade kibana to a fixed version for your release line: 8.19.11 or 9.2.5.
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-2026-26936 being exploited?
There is no known exploitation of CVE-2026-26936 in the wild and no public exploit code.
Other vulnerabilities in Elastic Kibana
Sources
Also known as BIT-elk-2026-26936, BIT-kibana-2026-26936, GHSA-rr4q-h87q-gm3v, MINI-57r2-cj4j-jg9f, MINI-8gwg-3x7j-x6hf, MINI-9qxm-rvgj-86wj and 2 more.