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CVE-2026-103005

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

Elastic ElasticsearchDatabases
Open in ThreatlineRecord JSON
CVSS
6.5Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.31%Chance of exploitation activity in the next 30 days, higher than 22% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published6 Oct 2026Updated 6 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 4

  • Elasticsearchaffected: 8.12.0 through 8.19.22CVE List
  • Elasticsearchaffected: 9.0.0 through 9.3.8CVE List
  • Elasticsearchaffected: 9.4.0 through 9.4.7CVE List
  • Elasticsearchaffected: 9.5.0 through 9.5.4CVE List

References 1