What is CVE-2026-56149?

CVE-2026-56149 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.9/10. Published 2026-07-01.

How severe is CVE-2026-56149?

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

Resource exhaustion in Elastic Elasticsearch

CVE-2026-56149

Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to a denial of service via Excessive Allocation (CAPEC-130). A user with elevated privileges can submit a specially crafted machine learning request that causes excessive memory consumption, which may render the affected node unavailable.

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 Elasticsearch — versions 9.4.0, 9.0.0, 8.0.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security@elastic.co (Vendor Advisory)

Frequently asked questions

What is CVE-2026-56149?: CVE-2026-56149 is a medium-severity vulnerability in Elastic Elasticsearch, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.9/10. Published 2026-07-01.
How severe is CVE-2026-56149?: Medium severity. CVSS v3 base score is 4.9 out of 10.