CVE-2026-103008 Uncontrolled Recursion in Elasticsearch Leading to Denial of Service
An authenticated user can cause a denial of service in Elasticsearch by submitting a crafted request that triggers uncontrolled recursion during geometry serialization.
- 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-2026-103008?
CVE-2026-103008 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 lead to Denial of Service via a specially crafted request that causes the server to construct and process a deeply nested data structure with no bound on recursion depth. Elasticsearch contains an uncontrolled recursion weakness in how it builds and serializes geometry values produced by scripted runtime fields. Unlike geometry supplied as text, which is subject to a nesting-depth limit, geometry constructed from a script's output is not bounded. An authenticated user with read access to a single index can submit a request defining such a field with a script that produces a deeply nested structure. Processing this request recurses past the available stack space, causing the affected node to terminate. The node does not recover automatically on all deployments and may require manual intervention to restore service.
Weakness: CWE-674
Which versions are affected by CVE-2026-103008?
1 open source package ship an affected version, including elasticsearch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
elasticsearch Bitnami | From 8.12.0 | 8.19.23, 9.4.8, 9.5.5 |
Products include Elastic Elasticsearch.
How do I fix CVE-2026-103008?
Upgrade elasticsearch to a fixed version for your release line: 8.19.23, 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-2026-103008 being exploited?
There is no known exploitation of CVE-2026-103008 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-2026-103008, CLEANSTART-2026-WV62539, GHSA-j6cv-2j5r-6m5f, MINI-27v9-5qr4-wpqg, MINI-2c4f-q245-3qjm, MINI-7mr5-4rj3-7gg9 and 18 more.