What is CVE-2026-26940?

CVE-2026-26940 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-03-19.

How severe is CVE-2026-26940?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Elastic Kibana

CVE-2026-26940

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 speciall…

EPSS: 0.001 (22.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Elastic Kibana — versions 9.3.0, 9.0.0, 8.0.0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

discuss.elastic.co/t/kibana-8-19-13-9-2-7-9-3-2-security-update-esa-2026-20/385…

Frequently asked questions

What is CVE-2026-26940?: CVE-2026-26940 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-03-19.
How severe is CVE-2026-26940?: Medium severity. CVSS v3 base score is 6.5 out of 10.