CVE-2026-63136 Uncontrolled Resource Consumption in Elasticsearch Leading to Denial of Service
An attacker with search privileges can cause Elasticsearch nodes to exhaust heap memory, leading to cluster downtime and service unavailability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63136?
CVE-2026-63136 is a medium-severity denial of service vulnerability in Elastic Elasticsearch, published on 21 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Uncontrolled Resource Consumption (CWE-400) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). A user with search privileges can submit a specially crafted search request that causes a data node to exhaust available heap memory, resulting in node unavailability and cluster degradation. An attacker could leverage this vulnerability to cause cluster downtime requiring manual intervention to restore service.
Weakness: CWE-400
Which versions are affected by CVE-2026-63136?
1 open source package ship an affected version, including elasticsearch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
elasticsearch Bitnami | From 8.0.0 | 8.19.15, 9.2.9, 9.3.4 |
Products include Elastic Elasticsearch.
How do I fix CVE-2026-63136?
Upgrade elasticsearch to a fixed version for your release line: 8.19.15, 9.2.9 or 9.3.4.
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-2026-63136 being exploited?
There is no known exploitation of CVE-2026-63136 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-2026-63136, CLEANSTART-2026-YK51895, GHSA-g5rr-fgvg-q29h, MINI-2mqh-mgq2-xpcr, MINI-2x72-2pfc-5v6m, MINI-53p6-787c-j523 and 15 more.