CVE-2026-33378

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

State: Published
Severity: 6.5 Medium
Published: May 13, 2026
Updated: Aug 27, 2026
Reserved: Mar 19, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	GRAFANA

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
Grafana OSSGrafana	8.0.0 through 11.6.14Affected 11.6.14 to before 11.6.14+security-04Affected 12.0.0 through 12.2.8Affected 12.2.8 to before 12.2.8+security-04Affected 12.3.0 through 12.3.6Affected 12.3.6 to before 12.3.6+security-04Affected 12.4.0 through 12.4.3Affected 12.4.3 to before 12.4.3+security-02Affected 13.0.0 through 13.0.1Affected 13.0.1 to before 13.0.1+security-01Affected

References

https://grafana.com/security/security-advisories/cve-2026-33378vendor-advisory

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