CVE-2026-72656 — Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service

CVE-2026-72656

Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service PUBLISHED

Description (CNA)

Memory Allocation with Excessive Size Value (CWE-789) in the ES|QL query processing of Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user able to submit ES|QL queries could send a specially crafted query whose evaluation allocates an unbounded amount of heap memory, exhausting the available heap on the receiving node and causing the node to become unavailable.

Affected (CNA)

Vendor / product	Versions
Elastic / Elasticsearch	affected 8.11.0 through 8.17.9

CWE

CWE-789

References

https://discuss.elastic.co/t/elasticsearch-8-18-0-9-0-0-security-update-esa-2026-111/389495

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.