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TI-2026-50916 Aliases CVE-2026-72678GHSA-wv4v-8jh9-247v

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

Priority LOW 29CWE-789Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-789.

Summary

Elasticsearch does not validate a size value taken from a user-supplied input before that value is used to reserve memory for an internal data structure. An authenticated user holding only read privileges can submit a single small crafted request to a product API endpoint that causes the node to attempt an excessively large allocation. The resulting memory exhaustion raises a fatal error that terminates the Elasticsearch node process, causing a denial of service for the affected node and degrading cluster health. The defect is not volumetric, so a single request is sufficient regardless of the heap size configured on the target node.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00472 41st percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ElasticElasticsearch8.19.0 – 8.19.19; 9.4.0 – 9.4.4; 9.5.0—No fix listedCNA
  • Elasticsearch VendorElastic Affected 8.19.0 – 8.19.19; 9.4.0 – 9.4.4; 9.5.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:*8.19.0 to before 8.19.20; 9.4.0 to before 9.4.5; 9.5.0 to before 9.5.1VulnerableElastic
  • cpe:2.3:a:elastic:elasticsearch:*:*:*:*:*:*:*:* Versions 8.19.0 to before 8.19.20; 9.4.0 to before 9.4.5; 9.5.0 to before 9.5.1 Vulnerable ·Elastic

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-72678
  2. 2026-10-03 Alias added: GHSA-wv4v-8jh9-247v

References

Advisory 1

  • TI-2015-01295 The Groovy scripting engine in Elasticsearch before 1.3.8 and 1.4.x before 1.4.3 allows… KEVCVSS 3.1CRITICAL 9.8
  • TI-2014-02491 The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which… KEVCVSS 3.1HIGH 8.1
  • TI-2023-15037 Elasticsearch StackOverflow vulnerability CVSS 3.1HIGH 7.5
  • TI-2021-05135 Information disclosure in Elasticsearch CVSS 3.1MEDIUM 6.5
  • TI-2021-05136 All versions of Elastic Cloud Enterprise has the Elasticsearch “anonymous” user enabled… CVSS 3.1HIGH 7.5
  • TI-2015-04530 Elasticsearch before 1.6.1 allows remote attackers to execute arbitrary code via… CVSS 3.0CRITICAL 9.8
See all 90 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences