Vulnerability · Published Oct 13, 2026 · Assigned by GRAFANA
CVE-2026-33374Unbounded memory allocation in the Prometheus rule conversion API
Medium 6.5
In plain English
A medium-severity resource allocation without limits in Grafana Enterprise from Grafana. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 69.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | grafana | 12.4.14-r0 | ALPINE-CVE-2026-33374 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Grafana | Grafana Enterprise | 12.0.0 – through 12.3.1112.4.0 – before 12.4.1313.0.0 – before 13.0.1113.1.0 – before 13.1.813.2.0 – before 13.2.4 |
| Grafana | Grafana OSS | 12.0.0 – through 12.3.1112.4.0 – before 12.4.1313.0.0 – before 13.0.1113.1.0 – before 13.1.813.2.0 – before 13.2.4 |
Weakness: CWE-770, CWE-400, CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- https://grafana.com/security/security-advisories/cve-2026-33374 vendor-advisory