What is CVE-2026-26934?

CVE-2026-26934 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-02-26.

How severe is CVE-2026-26934?

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

Vulnerability in Elastic Kibana

CVE-2026-26934

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.

EPSS: 0.003 (19.7th 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 8.18.0, 9.0.0, 9.3.0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

security@elastic.co (Vendor Advisory)

Frequently asked questions

What is CVE-2026-26934?: CVE-2026-26934 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Validation of Specified Quantity in Input. CVSS score: 6.5/10. Published 2026-02-26.
How severe is CVE-2026-26934?: Medium severity. CVSS v3 base score is 6.5 out of 10.