CVE-2026-72678 — Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service
Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user h…
Published: 2026-08-13 · CVSS: 6.5 · CVSS 3.1
Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7