# Elasticsearch 8.19.17, 9.3.6, 9.4.3 Security Update (ESA-2026-43)

**URL:** <https://discuss.elastic.co/t/elasticsearch-8-19-17-9-3-6-9-4-3-security-update-esa-2026-43/387440>\
**Category:** Security Announcements\
**Created:** [July 1, 2026, 1:51pm UTC](https://discuss.elastic.co/t/elasticsearch-8-19-17-9-3-6-9-4-3-security-update-esa-2026-43/387440 "2026-07-01T13:51:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kruskall](https://avatars.discourse-cdn.com/v4/letter/k/ac91a4/32.png) [@kruskall](https://discuss.elastic.co/u/kruskall)\
**Post date:** [July 1, 2026, 1:51pm UTC](https://discuss.elastic.co/t/elasticsearch-8-19-17-9-3-6-9-4-3-security-update-esa-2026-43/387440/1 "2026-07-01T13:51:51Z")

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**Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service**

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.

**Affected Versions:**

- 8.x: All versions from 8.0.0 up to and including 8.19.16
- 9.x:
  - All versions from 9.0.0 up to and including 9.3.5
  - All versions from 9.4.0 up to and including 9.4.2

**Affected Configurations:**

- Affects deployments that use machine learning. Exploitation requires an account with privileges to create or manage trained models.

**Solutions and Mitigations:**

The issue is resolved in version 8.19.17, 9.3.6, and 9.4.3.

**For Users that Cannot Upgrade:**

There are no workarounds for this vulnerability.

**Indicators of Compromise (IOC)**

No specific indicators of compromise have been identified for this vulnerability.

**Elastic Cloud Serverless**

Due to our continuous deployment and patching model, the vulnerability described in this security advisory was remediated in our Elastic Cloud Serverless offering before the public disclosure.

**Severity:** CVSSv3.1: Medium ( 4.9 ) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H  
**CVE ID:** CVE-2026-56149  
**Problem Type:** CWE-770 - Allocation of Resources Without Limits or Throttling  
**Impact:** CAPEC-130 - Excessive Allocation