CVE-2026-33378: Grafana

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.

Affected products

• Grafana Grafana: from 8.0.0, before 11.6.14 (fixed in 11.6.14); from 12.0.0, before 12.2.8 (fixed in 12.2.8); from 12.3.0, before 12.3.6 (fixed in 12.3.6); from 12.4.0, before 12.4.3 (fixed in 12.4.3); version 11.6.14 only; version 12.2.8 only; …

Published 2026-05-13. Last modified 2026-06-17.