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ElasticCVE-2026-63144

Elasticsearch: denial of service

Medium6.5CVE-2026-63144 · Published Jul 21, 2026 · updated Aug 3, 2026

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.

Elastic advisory

Affected versions

PackageAffectedFixed in
Elasticsearch
Product
>= 9.4.0, <= 9.4.3No fix yet
>= 9.3.0, <= 9.3.7No fix yet
>= 8.19.0, <= 8.19.18No fix yet
Details and references
CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity from
the vendor (its own CVE record or advisory)
Weakness
CWE-674

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