CVE-2026-33378 MEDIUM

CVE-2026-33378: Grafana Data Source Plugin: DoS (OOM) via Negative Interval Injection in $__timeGroup Macro

Vendor Grafana
Product Grafana OSS
Published May 13, 2026
Last update June 12, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
June 12, 2026 Record updated