Kibana AI Inference Engine DoS via Regex Blowup
CVE-2026-26936 Published on February 26, 2026
Inefficient Regular Expression Complexity in Kibana Leading to Denial of Service
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).
Vulnerability Analysis
CVE-2026-26936 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a ReDoS Vulnerability?
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. Some regular expression engines have a feature called "backtracking". If the token cannot match, the engine "backtracks" to a position that may result in a different token that can match. Backtracking becomes a weakness if all of these conditions are met:
CVE-2026-26936 has been classified to as a ReDoS vulnerability or weakness.
Products Associated with CVE-2026-26936
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Affected Versions
Elastic Kibana:- Version 9.0.0, <= 9.2.4 is affected.
- Version 8.0.0, <= 8.19.10 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.