CVE-2026-63144 — Uncontrolled Recursion in Elasticsearch Leading to Denial of Service

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
Elastic / Elasticsearch	affected 9.4.0 through 9.4.3; affected 9.3.0 through 9.3.7; affected 8.19.0 through 8.19.18

CWE

CWE-674

References

https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-security-update-esa-2026-68/388571

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.