CVE-2026-103005

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

State: Published
Severity: 6.5 Medium
Published: Oct 6, 2026
Updated: Oct 6, 2026
Reserved: Sep 29, 2026

Description

Memory Allocation with Excessive Size Value (CWE-789) in Elasticsearch can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user with connector management privileges could cause the cluster to allocate an uncontrolled amount of memory when connector resources with an excessively large `description` field are created and subsequently accessed, exhausting available heap memory and crashing the affected node.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	elastic

Weaknesses

CWE-789 Memory Allocation with Excessive Size Value

Affected Products

Product	Versions
ElasticsearchElastic	8.12.0 through 8.19.22Affected 9.0.0 through 9.3.8Affected 9.4.0 through 9.4.7Affected 9.5.0 through 9.5.4Affected

References

https://discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026-195/390869

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