CVE-2026-26940: Elastic Kibana

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Elastic Kibana: from 8.0.0, before 8.19.13 (fixed in 8.19.13); from 9.0.0, before 9.2.7 (fixed in 9.2.7); from 9.3.0, before 9.3.2 (fixed in 9.3.2)

Published 2026-03-19. Last modified 2026-06-17.