What is CVE-2026-33378?

CVE-2026-33378 is a medium-severity vulnerability in Grafana, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-05-13.

How severe is CVE-2026-33378?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Grafana

CVE-2026-33378

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…

Vulnerability class: DoS (Denial of Service)

EPSS: 0.000 (5.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Grafana — versions 11.6.14, 12.2.8, 12.3.6
Grafana Oss — versions 8.0.0, 11.6.14, 12.0.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security@grafana.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33378?: CVE-2026-33378 is a medium-severity vulnerability in Grafana, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-05-13.
How severe is CVE-2026-33378?: Medium severity. CVSS v3 base score is 6.5 out of 10.