CVE-2026-63140

published 2026-07-21

CVE-2026-63140: Reachable Assertion (CWE-617) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). A specially crafted search request…

Priority P3 37 medium 6.5 CVSS 3.1

AV N AC L PR L UI N S U C N I N A H

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.

Affected

6 ranges

Vendor	Product	Version range	Fixed in
elastic	elasticsearch	>= 8.0.0 < 8.19.19	8.19.19
elastic	elasticsearch	8.0.0 – 8.19.18	—
elastic	elasticsearch	>= 9.0.0 < 9.3.8	9.3.8
elastic	elasticsearch	9.0.0 – 9.3.7	—
elastic	elasticsearch	>= 9.4.0 < 9.4.4	9.4.4
elastic	elasticsearch	9.4.0 – 9.4.3	—

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CWE-617