6.5

CVE-2026-72639

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

Elasticsearch does not enforce an upper bound on a user-supplied count accepted by a search highlighting option, and the allocation derived from that count is not accounted against any circuit breaker. An authenticated user holding only read privileges on a single searchable index can submit one small search request that causes the node to reserve an excessively large internal data structure. The allocation occurs before the existing highlighting safety limits are evaluated, so memory exhaustion raises a fatal error that terminates the Elasticsearch node process. This results in a denial of service for the affected node and degrades cluster routing and health. The defect is not volumetric and does not depend on the size of the indexed data, so a single request is sufficient.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Elastic ≫ Elasticsearch Version >= 8.19.0 < 8.19.20
Elastic ≫ Elasticsearch Version >= 9.3.0 < 9.4.5
Elastic ≫ Elasticsearch Version >= 9.5.0 < 9.5.1
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.29% 0.213
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security@elastic.co 6.5 2.8 3.6
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-789 Memory Allocation with Excessive Size Value

The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

https://discuss.elastic.co/t/elasticsearch-8-19-20-9-4-5-9-5-1-security-update-esa-2026-120/389503
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