What is CVE-2026-103005?

CVE-2026-103005 is a medium-severity vulnerability in Elastic Elasticsearch, classified under CWE-789. CVSS score: 6.5/10. Published 2026-10-06.

How severe is CVE-2026-103005?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Elastic Elasticsearch

CVE-2026-103005

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.

Published 2026-10-06 · last modified 2026-10-07.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Elastic Elasticsearch

Weakness classification (CWE)

CWE-789

References

discuss.elastic.co/t/elasticsearch-8-19-23-9-4-8-9-5-5-security-update-esa-2026…

Frequently asked questions

What is CVE-2026-103005?: CVE-2026-103005 is a medium-severity vulnerability in Elastic Elasticsearch, classified under CWE-789. CVSS score: 6.5/10. Published 2026-10-06.
How severe is CVE-2026-103005?: Medium severity. CVSS v3 base score is 6.5 out of 10.