Kibana DoS via Improper Quantity Validation
CVE-2026-26934 Published on February 26, 2026
Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service
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.
Vulnerability Analysis
CVE-2026-26934 is exploitable with network access, and requires small amount of 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
Improper Validation of Specified Quantity in Input
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.
Products Associated with CVE-2026-26934
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Affected Versions
Elastic Kibana:- Version 8.18.0, <= 8.19.11 is affected.
- Version 9.0.0, <= 9.2.5 is affected.
- Version 9.3.0, <= 9.3.0 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.