CVE-2026-63140
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
21/07/2026
Last modified:
22/07/2026
Description
Reachable Assertion (CWE-617) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). A specially crafted search request containing a null value in a specific query clause causes an internal assertion to be raised during query parsing. Because Elasticsearch treats assertion failures as fatal errors, this terminates the affected node process. A low-privileged authenticated user with read access to at least one index can exploit this condition with a single request to cause a node to terminate, disrupting search availability. In a single-node deployment this fully stops Elasticsearch; in a multi-node cluster it reduces cluster capacity for each affected node.
Impact
Base Score 3.x
6.50
Severity 3.x
MEDIUM