CVE-2026-33374: Unbounded memory allocation in the Prometheus rule conversion API
Medium · CVSS 6.5 (CVSS 3.1)EPSS 0.37%, 30th percentilePublished Updated Assigner: GRAFANA
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.
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H · CWE-400, CWE-770, CWE-789
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Grafana: Grafana EnterpriseGrafana: Grafana OSS
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- grafana.com/security/security-advisories/cve-2026-33374 (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)