CVE-2026-72638

Uncontrolled Recursion in Elasticsearch Leading to Denial of Service

State: Published
Severity: 6.5 Medium
Published: Aug 13, 2026
Updated: Aug 13, 2026
Reserved: Aug 10, 2026

Description

Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). An authenticated user holding only low-privileged index creation permissions can submit a single request containing a specially crafted, malformed custom analysis definition that is resolved recursively without a cycle or depth check, exhausting the thread stack and terminating the affected node.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	elastic

Weaknesses

CWE-674 Uncontrolled Recursion

Affected Products

Product	Versions
ElasticsearchElastic	8.0.0 through 8.19.19Affected 9.0.0 through 9.4.4Affected

References

https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-security-update-esa-2026-119/389498

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