# CVE-2026-63144

## Summary

- **CVE ID:** CVE-2026-63144
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-674
- **Published:** Jul 21, 2026
- **Last Modified:** Jul 22, 2026

## Description

Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via a specially crafted search request submitted by a low-privileged authenticated user. A user with read-level index access can submit a request that triggers unbounded recursive processing within the Elasticsearch query evaluation component, causing a fatal error that terminates the affected node. In single-node deployments, this results in complete service outage; in multi-node clusters, it causes repeated node restarts and sustained availability degradation.

## Affected Products

- Elastic — Elasticsearch (9.4.0)
- Elastic — Elasticsearch (9.3.0)
- Elastic — Elasticsearch (8.19.0)

## References

- [CNA](https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-68/388571)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.24%
- **EPSS Percentile:** 15.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._