CVE-2026-33374

Unbounded memory allocation in the Prometheus rule conversion API

6.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.37%Unchanged since Oct 14, 2026

What each source reports

CVE List Score used 6.5

Unbounded memory allocation in the Prometheus rule conversion API

Record: CVE-2026-33374
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-770, CWE-400, CWE-789
Updated: 2026-11-02

EUVDEUVD-2026-98905 6.5

Record: EUVD-2026-98905
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-5mj5-pfmr-wxjp 6.5

The Prometheus rule conversion API endpoints in Grafana do not limit request body size, allowing...

Record: GHSA-5mj5-pfmr-wxjp
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400
Updated: 2026-11-02

NVD 6.5

Record: CVE-2026-33374
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-400, CWE-770, CWE-789
Updated: 2026-11-02

OSVALPINE-CVE-2026-33374 6.5

Record: ALPINE-CVE-2026-33374
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-04

OSVRHSA-2026:84422 6.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record: RHSA-2026:84422
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2026:85544 6.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record: RHSA-2026:85544
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-33374 6.5

Record: UBUNTU-CVE-2026-33374
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVBIT-grafana-2026-33374 No score

Unbounded memory allocation in the Prometheus rule conversion API

Record: BIT-grafana-2026-33374
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`grafana` Alpine:v3.24	before 12.4.14-r0	12.4.14-r0
`grafana` Bitnami	12.0.0 up to 12.4.13, 13.0.0 up to 13.0.11, 13.1.0 up to 13.1.8, 13.2.0 up to 13.2.4	12.4.1313.0.1113.1.813.2.4
`grafana12.4` Red Hat:hummingbird:1	before 0:12.4.12-0.5.hum1	0:12.4.12-0.5.hum1
`grafana13.2` Red Hat:hummingbird:1	before 0:13.2.4-0.1.hum1	0:13.2.4-0.1.hum1
`grafana` Ubuntu:16.04:LTS	All versions, plus listed versions 2.6.0+dfsg-1	None known

History

History
Recorded	Changed	Sources
Nov 4, 2026	affected, aliases, facts, references	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-33374 is a medium vulnerability (CVSS 6.5) in Grafana Enterprise, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 30th percentile. Fixed in grafana 12.4.14-r0.

References

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