CVE-2026-21729
Serial number: AV26-710 Date: July 16, 2026 On July 15, 2026, Grafana published security advisories to address vulnerabilities in the following products: Grafana MCP Server – version 0.17.1 and prior Grafana Loki – version 3.7.0 and prior The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary updates. Grafana MCP server-side request forgery via X-Grafana-URL header Loki detected_fields query limits results in unbounded memory allocation Grafana Blog
CSIRTS triage
- What
- A server-side request forgery vulnerability exists via the X-Grafana-URL header.
- Who is affected
- Users of Grafana MCP Server version 0.17.1 and prior.
- Urgency
- Remediation is necessary to prevent potential exploitation.
- Action
- Update to the latest version as recommended.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all EPSS-scored CVEs.
Advisory coverage (3)
- medium[NEW] [medium] Grafana Loki: Vulnerability allows Denial of Servicecert-bund · 2026-07-17
- unknownGrafana security advisory (AV26-710)cccs · 2026-07-16
- highCVE-2026-21729: Loki queries with large limits can cause large memory allocations which can impact the availab…nvd · 2026-07-16
External references
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