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CVE-2026-33374— Unbounded memory allocation in the Prometheus rule conversion API

Quick assessment

Affected
Grafana Grafana Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Grafana 中的 Prometheus 规则转换 API 端点未对请求体大小进行限制，允许已认证用户触发无限制的内存分配，从而导致服务器因内存溢出（OOM）而崩溃。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 10

VendorProduct Version RangeStatus
Grafana Grafana Enterprise 12.0.0≤ 12.3.11 affected
12.4.0< 12.4.13 affected
13.0.0< 13.0.11 affected
13.1.0< 13.1.8 affected
13.2.0< 13.2.4 affected
Grafana Grafana OSS 12.0.0≤ 12.3.11 affected
12.4.0< 12.4.13 affected
13.0.0< 13.0.11 affected
13.1.0< 13.1.8 affected
13.2.0< 13.2.4 affected
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I. Basic Information for CVE-2026-33374

Vulnerability Information
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Vulnerability Title
Unbounded memory allocation in the Prometheus rule conversion API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Grafana Grafana Enterprise 12.0.0 ~ 12.3.11 -
Grafana Grafana OSS 12.0.0 ~ 12.3.11 -

II. Public POCs for CVE-2026-33374

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III. Intelligence Information for CVE-2026-33374

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Other References for CVE-2026-33374 (1)

Same Patch Batch · Grafana · 2026-10-13 · 4 CVEs total

CVE-2026-15577 6.5 MEDIUM Git Sync connection configuration can be modified with read-only access
CVE-2026-93294 6.3 MEDIUM Azure Monitor data source resource proxy allows calls to arbitrary Azure Resource Manager
CVE-2026-95502 5.3 MEDIUM Git Sync memory exhaustion via a malicious Git server

IV. Related Vulnerabilities

Same product: Grafana Enterprise
Same vendor: Grafana
Same weakness: CWE-770

V. Comments for CVE-2026-33374

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