# Elasticsearch 8.19.20, 9.3.0 Security Update (ESA-2026-47) **URL:** \ **Category:** Security Announcements\ **Created:** [September 1, 2026, 6:43pm UTC](https://discuss.elastic.co/t/elasticsearch-8-19-20-9-3-0-security-update-esa-2026-47/390084 "2026-09-01T18:43:23Z")\ **Posts on this page:** 1\ **Showing post:** 1
**Author:** ![ismisepaul](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ismisepaul/32/102235_2.png) [@ismisepaul](https://discuss.elastic.co/u/ismisepaul)\ **Post date:** [September 1, 2026, 6:43pm UTC](https://discuss.elastic.co/t/elasticsearch-8-19-20-9-3-0-security-update-esa-2026-47/390084/1 "2026-09-01T18:43:23Z")
**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 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 8.19.19 > - 9.x: All versions from 9.0.0 up to and including 9.2.8 **Affected Configurations:** All configurations are affected. **Solutions and Mitigations:** The issue is resolved in Elasticsearch versions 8.19.20 and 9.3.0 and greater. **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-2026-56143 **Problem Type:** CWE-770 - Allocation of Resources Without Limits or Throttling **Impact:** CAPEC-130 - Excessive Allocation --- _[View the full topic](https://discuss.elastic.co/t/elasticsearch-8-19-20-9-3-0-security-update-esa-2026-47/390084)._