What is CVE-2026-94399?

CVE-2026-94399 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-26.

How severe is CVE-2026-94399?

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

Resource exhaustion in Elastic Elasticsearch

CVE-2026-94399

Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead denial of service via Excessive Allocation (CAPEC-130)

Vulnerability class: DoS (Denial of Service)

Published 2026-09-26 · last modified 2026-09-29.

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.

EPSS exploit prediction

EPSS: 0.002 (15.2th percentile), scored 2026-11-11.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.002 · change: -0.002

Affected products

Elastic Elasticsearch

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

discuss.elastic.co/t/elasticsearch-8-19-22-9-4-7-9-5-4-security-update-esa-2026… (Vendor Advisory)

Frequently asked questions

What is CVE-2026-94399?: CVE-2026-94399 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-09-26.
How severe is CVE-2026-94399?: Medium severity. CVSS v3 base score is 6.5 out of 10.