Uncontrolled Recursion Vulnerability in Elasticsearch by Elastic
CVE-2026-63144

6.5MEDIUM

Key Information:

Vendor

Elastic
Status
Elastic
Vendor
CVE Published:
21 July 2026

What is CVE-2026-63144?

A vulnerability in Elasticsearch allows a low-privileged authenticated user to submit a specially crafted search request that can exploit uncontrolled recursion in the query evaluation process. This can lead to a denial of service, causing a complete service outage in single-node deployments and repeated node restarts in multi-node clusters, severely impacting service availability.

Affected Version(s)

Elasticsearch 9.4.0 <= 9.4.3

Elasticsearch 9.3.0 <= 9.3.7

Elasticsearch 8.19.0 <= 8.19.18

References

https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.