CVE-2026-26934

Improper Validation of Specified Quantity in Input in Kibana Leading to Denial of Service

State: Published
Severity: 6.5 Medium
Published: Feb 26, 2026
Updated: Feb 26, 2026
Reserved: Feb 16, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	elastic

Weaknesses

CWE-1284 Improper Validation of Specified Quantity in Input

Affected Products

Product	Versions
KibanaElastic	8.18.0 through 8.19.11Affected 9.0.0 through 9.2.5Affected 9.3.0 through 9.3.0Affected

References

https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-12/385248

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