What’s Vulnerable › Vulnerabilities
CVE-2026-103005: Memory Allocation with Excessive Size Value in Elasticsearch Leading to Denial of Service
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-06 · updated 2026-10-09
- Weakness: CWE-789
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.
Affected products
- Elasticsearch: from 8.12.0 before 8.19.23; from 9.0.0 through 9.3.8; from 9.4.0 before 9.4.8; from 9.5.0 before 9.5.5 — fixed in 8.19.23, 9.4.8, 9.5.5
How to fix
Upgrade to a fixed version: Elasticsearch 8.19.23, 9.4.8, 9.5.5. Check the vendor advisory for mitigations.
References
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