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

unknownCVE-2026-75897
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 and 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. Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

CSIRTS triage

vendor: Amazonproduct: OpenSearch DashboardsDenial of serviceaffected: 1.3.0 through 3.7.0, 2.0 through 2.19.6, and inherited from Kibana 7.7.1 through 7.10.2
What
OpenSearch Dashboards contains improper input validation in the capabilities route handler allowing unbounded resource consumption.
Who is affected
OpenSearch Dashboards self-managed deployments and Amazon OpenSearch Service instances running versions 1.3.0 through 3.7.0 or Kibana 7.7.1 through 7.10.2.
Urgency
Important; denial of service vulnerability enabling remote attackers to consume server resources via crafted requests.
Action
Upgrade OpenSearch Dashboards to version 3.8.0 or later, or upgrade Kibana to 7.10.3 or later.

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Details

Source
AWS Security Bulletins (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-08-20
Exploitation
Not in CISA KEV at last sync

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/2026-082-aws/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-75897coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for - Uncontrolled resource

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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