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Back to active CVEs
Medium · CVSS 6.5CVE-2026-81843

Memory exhaustion denial of service in Elasticsearch data source index patternsCVE-2026-81843

Answer in brief

CVE-2026-81843 records a Medium severity (CVSS 6.5) vulnerability in Memory exhaustion denial of service in Elasticsearch data source index patterns. The current sources do not mark it as known exploited. The current feed maps Grafana/Elasticsearch Datasource (generic), Grafana/Grafana Enterprise (generic), Grafana/Grafana OSS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 12, 2026Updated Nov 12, 2026Source checked Nov 12, 2026First seen by HOL Nov 12, 2026Material review Nov 12, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.5
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Grafana/Elasticsearch Datasource (generic), Grafana/Grafana Enterprise (generic), Grafana/Grafana OSS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Grafana/Elasticsearch Datasourcegeneric>=12.4.2 <12.9.612.9.6
Grafana/Grafana Enterprisegeneric>=11.6.0 <=11.6.16 || >=12.0.0 <=12.2.10 || >=12.3.0 <12.4.1512.4.15
Grafana/Grafana OSSgeneric>=11.6.0 <=11.6.16 || >=12.0.0 <=12.2.10 || >=12.3.0 <12.4.1512.4.15

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Grafana/Elasticsearch Datasource, Grafana/Grafana Enterprise, Grafana/Grafana OSS.
  2. 2Review the reported fix. Update Grafana/Elasticsearch Datasource to 12.9.6; Grafana/Grafana Enterprise to 12.4.15; Grafana/Grafana OSS to 12.4.15 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 12, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 12, 2026

Sources and claim methodology

  • Source referencegrafana.com
Upstream source description

Grafana is an open-source platform for monitoring and observability. When an Elasticsearch data source is configured with a time-based index pattern, Grafana generated one index name for every interval in the requested query time range without any upper limit. A user with permission to query the data source, which includes users holding only the Viewer role in a default configuration, could submit a single small query with an extreme time range and cause the server to allocate memory until it was terminated. The allocation occurred before any request was sent to Elasticsearch, so the condition applied whether or not the Elasticsearch cluster was reachable. Data sources configured with a static index name are not affected.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Server-side request forgery in the Prometheus data source resource APISame grafana/grafana enterprise package
  • Elasticsearch data source resource proxy allows arbitrary methods and paths with the data source's credentialsSame grafana/elasticsearch datasource package
  • Unintended API access through the Google Cloud Monitoring data source resource proxySame grafana/grafana enterprise package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Nov 12, 2026
References
1 linked source
Open source record