CVE-2026-103005 Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service
An authenticated user with connector privileges can crash Elasticsearch nodes by creating resources with excessively large description fields, exhausting heap memory.
- 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-2026-103005?
CVE-2026-103005 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
Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user with connector management privileges could cause the cluster to allocate an uncontrolled amount of memory when connector resources with an excessively large `description` field are created and subsequently accessed, exhausting available heap memory and crashing the affected node.
Weakness: CWE-789
Which versions are affected by CVE-2026-103005?
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-2026-103005?
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-2026-103005 being exploited?
There is no known exploitation of CVE-2026-103005 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-2026-103005, CLEANSTART-2026-UR21686, GHSA-6w6g-ww2r-qrcm, MINI-2wxj-hq4m-c23m, MINI-3vpc-jrjh-ccjm, MINI-4rqv-wgm6-68f7 and 18 more.