# CVE-2026-72687

## Summary

- **CVE ID:** CVE-2026-72687
- **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-789
- **Published:** Aug 13, 2026
- **Last Modified:** Aug 13, 2026

## Description

A flaw in Elasticsearch allows a low-privileged authenticated user to submit a single small request containing a forged opaque identifier. Elasticsearch decodes and deserializes the identifier before confirming that it was legitimately issued by the cluster, and a size value carried inside the identifier drives an allocation that is neither capped nor accounted for by the available memory-usage controls. The resulting out-of-memory condition is fatal and terminates the affected node process, resulting in a denial of service.

## Affected Products

- Elastic — Elasticsearch (8.0.0)
- Elastic — Elasticsearch (9.0.0)
- Elastic — Elasticsearch (9.5.0)

## References

- [CNA](https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-79/389506)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.30%
- **EPSS Percentile:** 22.1

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