CVE-2026-56143 Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service
Privileged users can cause denial of service in Elasticsearch by submitting crafted requests that trigger excessive memory consumption.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56143?
CVE-2026-56143 is a medium-severity denial of service vulnerability in Elastic Elasticsearch, published on 1 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-56143?
1 open source package ship an affected version, including elasticsearch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
elasticsearch Bitnami | From 8.0.0 | 8.19.20, 9.3.0 |
Products include Elastic Elasticsearch.
How do I fix CVE-2026-56143?
Upgrade elasticsearch to a fixed version for your release line: 8.19.20 or 9.3.0.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-56143 being exploited?
There is no known exploitation of CVE-2026-56143 in the wild and no public exploit code.
Other vulnerabilities in Elastic Elasticsearch
- CVE-2015-1427 Elasticsearch Groovy Scripting Engine Remote Code Execution
- CVE-2014-3120 Elasticsearch Remote Code Execution
- CVE-2015-5377 Code injection in n/a
- CVE-2026-72649 Deserialization of Untrusted Data in Elasticsearch Leading to Remote Code Execution
- CVE-2026-72642 Use of Out-of-range Pointer Offset in the Elasticsearch Machine Learning Native Inference Process
Sources
Also known as AZL-98448, BIT-elasticsearch-2026-56143, CLEANSTART-2026-HK32030, CLEANSTART-2026-UK62622, GHSA-vvr8-mhcc-gx9g, MINI-2m8v-pmvg-92wg and 17 more.