Is CVE-2026-63144 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-63144?

CVE-2026-63144 has a CVSS v3 severity of MEDIUM (6.5).

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CVE-2026-63144

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.