6.5
Medium
CVE-2026-72638 Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153)
Description
Uncontrolled Recursion (CWE-674) in Elasticsearch can lead to denial of service via Input Data Manipulation (CAPEC-153). An authenticated user holding only low-privileged index creation permissions can submit a single request containing a specially crafted, malformed custom analysis definition that is resolved recursively without a cycle or depth check, exhausting the thread stack and terminating the affected node.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Elasticsearch 9.0 | 9.0.0 → 9.4.4 | No fix stated |
| Elasticsearch 8.0 | 8.0.0 → 8.19.19 | No fix stated |
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High