# CVE-2026-82294: Elasticsearch uncontrolled resource consumption denial of service

Source: https://junglewise.ai/threats/cve-2026-82294-uncontrolled-resource-consumption-cwe-400-in-elasticsearch-can  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-26. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-82294 · Severity: medium · CVSS 6.5 · Published 2026-09-26

Elasticsearch, a widely-used search and analytics engine, contains a flaw that allows authenticated users to consume excessive system resources, causing the service to become unavailable. An attacker with valid credentials can trigger this issue through analytical aggregation queries, resulting in service outages that disrupt business operations.

Technologies: [Elasticsearch](https://junglewise.ai/threats/technologies/elasticsearch). Vendors: [Elastic](https://junglewise.ai/threats/vendors/elastic).

## Quick answers

**Is CVE-2026-82294 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82294 being exploited in the wild.

**How severe is CVE-2026-82294?** Medium severity, with a CVSS score of 6.5, published 26 September 2026.

**Which products and versions are affected?** Elasticsearch 8.0.0 through 8.19.20, 9.0.0 through 9.4.5, 9.5.0 through 9.5.2.

**Is there a fix for CVE-2026-82294?** A patch was published on 2026-09-26: Fixed in versions 8.19.21, 9.4.6, and 9.5.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-82294 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-82294?** Check whether you run Elasticsearch at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Uncontrolled Resource Consumption (CWE-400) in Elasticsearch's analytical aggregation search functionality allows authenticated users to exhaust system resources via excessive memory or CPU allocation. The vulnerability requires network access and valid authentication credentials; no user interaction is needed. Patches are available in versions 8.19.21, 9.4.6, and 9.5.3.

## Affected products

- Elastic Elasticsearch 8.0.0 through 8.19.20, 9.0.0 through 9.4.5, 9.5.0 through 9.5.2

## Timeline

- 2026-09-26: disclosed
- 2026-09-26: patched: Fixed in versions 8.19.21, 9.4.6, and 9.5.3

## References

- [https://discuss.elastic.co/t/elasticsearch-8-19-21-9-4-6-9-5-3-security-update-esa-2026-170/390681](https://discuss.elastic.co/t/elasticsearch-8-19-21-9-4-6-9-5-3-security-update-esa-2026-170/390681)

## Related threats

- [Elasticsearch denial of service in phonetic analysis encoders](https://junglewise.ai/threats/cve-2026-115715-allocation-of-resources-without-limits-or-throttling-cwe-770-in)
- [Elasticsearch cache information disclosure via field-level security bypass](https://junglewise.ai/threats/cve-2026-115710-use-of-cache-containing-sensitive-information-cwe-524-in)
- [Elasticsearch incorrect authorization in field-level security](https://junglewise.ai/threats/cve-2026-115298-incorrect-authorization-cwe-863-in-elasticsearch-can-lead-to)
- [Elasticsearch uncontrolled recursion denial of service](https://junglewise.ai/threats/cve-2026-115290-uncontrolled-recursion-cwe-674-in-elasticsearch-can-lead-to)
- [Elasticsearch authorization bypass in cross-cluster search](https://junglewise.ai/threats/cve-2026-103009-authorization-bypass-through-user-controlled-key-cwe-639-in)