CVE-2026-63140
MEDIUM
6.5
CVSS 3.1
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.
Metadata
Severity & Metrics
6.5
MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Elastic | Elasticsearch | — | 9.0.0 ≤ 9.3.7, 9.4.0 ≤ 9.4.3, 8.0.0 ≤ 8.19.18 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-617 | cna | CWE-617 Reachable Assertion |
CVSS scores (1)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 6.5 | MEDIUM | 3.1 | cna | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
References (1)