6.5
Medium
CVE-2026-63140 Reachable Assertion (CWE-617) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153)
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Elasticsearch 9.4 | 9.4.0 → 9.4.3 | No fix stated |
| Elasticsearch 9.0 | 9.0.0 → 9.3.7 | No fix stated |
| Elasticsearch 8.0 | 8.0.0 → 8.19.18 | No fix stated |
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