CVE-2026-56149 Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service
An authenticated user with elevated privileges can cause a denial of service by submitting crafted machine learning requests that exhaust memory resources.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56149?
CVE-2026-56149 is a medium-severity denial of service vulnerability in Elastic Elasticsearch, published on 1 Jul 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 machine learning request that causes excessive memory consumption, which may render the affected node unavailable.
Weakness: CWE-770
Which versions are affected by CVE-2026-56149?
1 open source package ship an affected version, including elasticsearch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
elasticsearch Bitnami | From 8.0.0 | 8.19.17, 9.3.6, 9.4.3 |
Products include Elastic Elasticsearch.
How do I fix CVE-2026-56149?
Upgrade elasticsearch to a fixed version for your release line: 8.19.17, 9.3.6 or 9.4.3.
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-2026-56149 being exploited?
There is no known exploitation of CVE-2026-56149 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 BIT-elasticsearch-2026-56149, CLEANSTART-2026-HO72909, CLEANSTART-2026-WN55033, GHSA-p6pw-6f2m-xxpg, MINI-2gmw-rjcc-6wqc, MINI-2pw4-5655-99qr and 18 more.