CVE-2026-33374

Unbounded memory allocation in the Prometheus rule conversion API

State: Published
Severity: 6.5 Medium
Published: Oct 13, 2026
Updated: Oct 13, 2026
Reserved: Mar 19, 2026

Description

The Prometheus rule conversion API endpoints in Grafana do not limit request body size, allowing authenticated users to trigger unbounded memory allocations that can crash the server through out-of-memory conditions.

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

Affected Products

Product	Versions
Grafana EnterpriseGrafana	12.0.0 through 12.3.11Affected 12.4.0 to before 12.4.13Affected 13.0.0 to before 13.0.11Affected 13.1.0 to before 13.1.8Affected 13.2.0 to before 13.2.4Affected
Grafana OSSGrafana	12.0.0 through 12.3.11Affected 12.4.0 to before 12.4.13Affected 13.0.0 to before 13.0.11Affected 13.1.0 to before 13.1.8Affected 13.2.0 to before 13.2.4Affected

References

https://grafana.com/security/security-advisories/cve-2026-33374vendor-advisory

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