CVE-2026-72685

Inefficient Algorithmic Complexity in Elasticsearch Leading to Denial of Service

State: Published
Severity: 4.3 Medium
Published: Aug 13, 2026
Updated: Aug 13, 2026
Reserved: Aug 10, 2026

Description

A flaw in Elasticsearch allows a low-privileged authenticated user who can index documents to submit a single small document containing a crafted user-supplied input. Processing one such document occupies a worker thread from a bounded pool for a disproportionate amount of time, degrading the availability of indexing operations on the affected node.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L	elastic

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

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-2026-77/389500

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