Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to Denial of Service via Excessive Allocation (CAPEC-130). Elasticsearch enforces a size limit on the user-supplied metadata field for each individual template resource, but does not limit the total memory used when multiple such resources are retrieved together. A user holding the *manage_index_templates* cluster privilege can register multiple resources each within the individual limit. Retrieving them together materializes all of their metadata values in memory at once, exhausting available heap and causing the affected node to fail with an out-of-memory error, resulting in a denial of service.
Fix
Patch, vendor advisory and mitigation references on NVD 1
- https://discuss.elastic.co/t/elasticsearch-9-4-7-9-5-3-8-19-23-security-update-esa-2026-192/390865 Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · elasticNVD modified 2026-10-09 15:49
Affected (CPE criteria) 1
cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*