Kibana Timelion Plugin DOS via Overly Large Quantity Value
CVE-2026-26940 Published on March 19, 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 the Timelion visualization plugin in Kibana can lead Denial of Service via Excessive Allocation (CAPEC-130). The vulnerability allows an authenticated user to send a specially crafted Timelion expression that overwrites internal series data properties with an excessively large quantity value.
Vulnerability Analysis
CVE-2026-26940 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-2026-26940
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Affected Versions
Elastic Kibana:- Version 9.3.0, <= 9.3.1 is affected.
- Version 9.0.0, <= 9.2.6 is affected.
- Version 8.0.0, <= 8.19.12 is affected.