What is CVE-2026-56145?

CVE-2026-56145 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-21.

How severe is CVE-2026-56145?

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

Resource exhaustion in Elastic Elasticsearch

CVE-2026-56145

Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). A low-privileged authenticated user with permission to execute EQL sequence queries against an index they control can send a specially crafted query that triggers excessive memory consumption, causing the Elasticsearch node to crash.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.003 (21.9th 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 Elasticsearch — versions 9.4.0, 8.0.0, 9.0.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security@elastic.co (Vendor Advisory)

Frequently asked questions

What is CVE-2026-56145?: CVE-2026-56145 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-21.
How severe is CVE-2026-56145?: Medium severity. CVSS v3 base score is 6.5 out of 10.