Out-of-Memory Vulnerability in Grafana Server by Grafana Labs
CVE-2026-33378

6.5MEDIUM

Key Information:

Vendor

Grafana
Status
Grafana Oss
Vendor
CVE Published:
13 May 2026

What is CVE-2026-33378?

The Grafana server is susceptible to an out-of-memory (OOM) vulnerability when using the $__timeGroup macro with a SQL datasource. This vulnerability allows an attacker to overload the server, potentially leading to service disruption. The server may crash if it is unable to handle the excessive data requests initiated through this macro. However, if the server is configured to automatically restart, the operational impact could be minimized, though the attack may still take significant time to execute.

Affected Version(s)

Grafana OSS OnPrem 8.0.0 <= 11.6.14

Grafana OSS OnPrem 11.6.14 < 11.6.14+security-04

Grafana OSS OnPrem 12.0.0 <= 12.2.8

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.