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CVE-2026-75897 - Uncontrolled resource consumption in OpenSearch Dashboards capabilities route

Bulletin ID: 2026-082-AWS
Scope: AWS
Content Type: Important (requires attention)
Publication Date: 08/18/2026 10:00 AM PDT

Description:

OpenSearch Dashboards is the open-source visualization and management UI for OpenSearch, and ships as part of Amazon OpenSearch Service. We identified CVE-2026-75897, an improper input validation in the capabilities route handler in OpenSearch Dashboards. The handler does not bound the size of the request payload, which might allow remote attackers to cause a denial of service via a crafted HTTP request.

Affected Products & Versions:

OpenSearch "Plugin Type" Plugin (open-source, self-managed):

  • Affected: All versions from 1.3.0 through 3.7.0 inclusive, including all 2.x releases up to and including 2.19.6. The issue is inherited from upstream Kibana and is also present in Kibana 7.7.1 through 7.10.2.
  • Fixed: 3.8.0

Amazon OpenSearch Service (AWS Managed):

  • Affected: Engine versions OpenSearch 1.3, 2.11, 2.13, 2.15, 2.17, 2.19, 3.1, 3.3, and 3.5, and Elasticsearch-compatibility versions using Kibana 7.9 and 7.10.
  • Fixed: A patched service software release is available for all affected versions. Apply the latest available service software update to your domain.

Amazon OpenSearch Serverless:

  • Not affected

Resolution:

  • OpenSearch Dashboards (open-source, self-managed):
    Upgrade to OpenSearch Dashboards 3.8.0 or later.

  • Amazon OpenSearch Service (AWS Managed):
    Apply the latest available service software update to your domain. The OpenSearch Service console Notifications panel indicates when an update is available for your domain. For instructions, see Service software updates in Amazon OpenSearch Service.

  • Amazon OpenSearch Serverless:
    No action required.

We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

Workarounds:

Deployments that place an authentication layer (reverse proxy, load balancer, or SAML/OIDC/Cognito/basic-auth login gate) in front of the OpenSearch Dashboards process are protected, because the affected route is only reachable post-authentication in that posture. Restricting network access to the Dashboards endpoint to trusted sources also reduces unintended disclosure.

References:


Please email aws-security@amazon.com with any security questions or concerns.