CVE-2026-26934 Details
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.
A denial-of-service vulnerability has been identified in Elastic Kibana versions 8.18.0 prior to 8.19.12, as well as in the 9.x series, specifically versions 9.0.0 prior to 9.2.6 and 9.3.0. This vulnerability arises from improper validation of input quantities, allowing an authenticated attacker with view-only privileges to manipulate input data. The exploitation of this vulnerability leads to excessive resource consumption, causing Kibana to become unresponsive or crash.
Users can upgrade to Kibana versions 8.19.12, 9.2.6, or 9.3.1 to address this vulnerability. For those unable to upgrade, it is recommended to monitor Kibana server resource usage, restrict access to trusted users, and consider implementing application-layer request size limits if possible.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Feb 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-12/385248 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1284 | Improper Validation of Specified Quantity in Input | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| elastic kibana | >= 8.18.0, < 8.19.12 >= 9.0.0, < 9.2.6 9.3.0 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 2, 2026 | Initial Analysis | [email protected] |
| Feb 26, 2026 | New CVE Received | [email protected] |