What is CVE-2026-26936?

CVE-2026-26936 is a medium-severity vulnerability in Elastic Kibana, classified under Inefficient Regular Expression Complexity. CVSS score: 4.9/10. Published 2026-02-26.

How severe is CVE-2026-26936?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Elastic Kibana

CVE-2026-26936

Inefficient Regular Expression Complexity (CWE-1333) in the AI Inference Anonymization Engine in Kibana can lead Denial of Service via Regular Expression Exponential Blowup (CAPEC-492).

Vulnerability class: ReDoS (Regular Expression Denial of Service)

EPSS: 0.003 (24.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Elastic Kibana — versions 9.0.0, 8.0.0

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

security@elastic.co (Vendor Advisory)

Frequently asked questions

What is CVE-2026-26936?: CVE-2026-26936 is a medium-severity vulnerability in Elastic Kibana, classified under Inefficient Regular Expression Complexity. CVSS score: 4.9/10. Published 2026-02-26.
How severe is CVE-2026-26936?: Medium severity. CVSS v3 base score is 4.9 out of 10.