# Elasticsearch 8.19.21, 9.4.6, 9.5.3 Security Update (ESA-2026-170)

**URL:** https://discuss.elastic.co/t/elasticsearch-8-19-21-9-4-6-9-5-3-security-update-esa-2026-170/390681
**Category:** Security Announcements
**Created:** [September 25, 2026, 8:33am UTC](https://discuss.elastic.co/t/elasticsearch-8-19-21-9-4-6-9-5-3-security-update-esa-2026-170/390681 "2026-09-25T08:33:09Z")
**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: [September 25, 2026, 8:33am UTC](https://discuss.elastic.co/t/elasticsearch-8-19-21-9-4-6-9-5-3-security-update-esa-2026-170/390681/1 "2026-09-25T08:33:09Z")

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**Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service**

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

Affected Versions:

- 8.x: All versions from 8.0.0 up to and including 8.19.20
- 9.x:
  - All versions from 9.0.0 up to and including 9.4.5
  - All versions from 9.5.0 up to and including 9.5.2

**Affected Configurations:**  
All configurations with analytical aggregation search capabilities enabled.

**Solutions and Mitigations:**

The issue is resolved in versions 8.19.21, 9.4.6, 9.5.3.

**For Users that Cannot Upgrade:**

There are no workarounds 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 ( 6.5 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H  
**CVE ID:** CVE-2026-82294  
**Problem Type:** CWE-400 - Uncontrolled Resource Consumption  
**Impact:** CAPEC-130 - Excessive Allocation