CVE-2026-102409 Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
An authenticated low-privilege user can crash an Elasticsearch node via uncontrolled recursion, causing denial of service.
- 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-2026-102409?
CVE-2026-102409 is a medium-severity denial of service vulnerability in Elastic Elasticsearch, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Uncontrolled Recursion (CWE-674) in Elasticsearch can allow an authenticated user with low privileges to terminate an Elasticsearch node, resulting in denial of service, via Excessive Allocation (CAPEC-130).
Weakness: CWE-674
Which versions are affected by CVE-2026-102409?
1 open source package ship an affected version, including elasticsearch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
elasticsearch Bitnami | From 9.2.0 | 9.4.8, 9.5.5 |
Products include Elastic Elasticsearch.
How do I fix CVE-2026-102409?
Upgrade elasticsearch to a fixed version for your release line: 9.4.8 or 9.5.5.
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-2026-102409 being exploited?
There is no known exploitation of CVE-2026-102409 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-2026-102409, GHSA-6g39-jvf9-2rf9, MINI-2pg9-f8q4-w6qj, MINI-335g-f4hp-x3vx, MINI-3gvp-cfvg-8p5v, MINI-47fr-84wj-q39g and 4 more.