Medium severity · published Oct 13, 2026
CVE-2026-33374
Unbounded memory allocation in the Prometheus rule conversion API
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
12.0.0 through 12.3.11; 12.4.0 before 12.4.13; 13.0.0 before 13.0.11; 13.1.0 before 13.1.8; 13.2.0 before 13.2.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33374
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33374
vendor-advisory
https://grafana.com/security/security-advisories/cve-2026-33374
More from Grafana
7.5
CVE-2021-43798
Grafana path traversal
7.3
CVE-2021-39226
Snapshot authentication bypass in grafana
9.8
CVE-2025-41115
Incorrect privilege assignment
9.8
CVE-2023-3128
Grafana is validating Azure AD accounts based on the email claim
9.8
CVE-2022-28660
The querier component in Grafana Enterprise Logs 1.1.x through 1.3.x before 1.4.0 does not require authentication when X-Scope-OrgID is used