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CVE-2026-33378— Grafana Data Source Plugin: DoS (OOM) via Negative Interval Injection in $__timeGroup Macro

Quick assessment

Affected
Grafana Grafana OSS
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 OSS是Grafana开源的一个可视化仪表盘。 Grafana OSS存在安全漏洞，该漏洞源于使用$__timeGroup宏可能导致服务器过载，引发OOM问题。

CVSS 6.5 · Medium EPSS 0.42% · P34

Affected Version Matrix 10

VendorProduct Version RangeStatus
Grafana Grafana OSS 8.0.0≤ 11.6.14 affected
11.6.14< 11.6.14+security-04 affected
12.0.0≤ 12.2.8 affected
12.2.8< 12.2.8+security-04 affected
12.3.0≤ 12.3.6 affected
12.3.6< 12.3.6+security-04 affected
12.4.0≤ 12.4.3 affected
12.4.3< 12.4.3+security-02 affected
… +2 more rows
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I. Basic Information for CVE-2026-33378

Vulnerability Information
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Vulnerability Title
Grafana Data Source Plugin: DoS (OOM) via Negative Interval Injection in $__timeGroup Macro
Source: CVE Program / CVE List V5
Vulnerability Description
Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a SQL datasource. If the server is set up to auto-restart, the impact is minimal or non-existent, as the attack can take upwards of half an hour to crash the server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Grafana OSS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Grafana OSS是Grafana开源的一个可视化仪表盘。 Grafana OSS存在安全漏洞，该漏洞源于使用$__timeGroup宏可能导致服务器过载，引发OOM问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Grafana Grafana OSS 8.0.0 ~ 11.6.14 -

II. Public POCs for CVE-2026-33378

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III. Intelligence Information for CVE-2026-33378

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Vendor Advisories for CVE-2026-33378 (1)

Same Patch Batch · Grafana · 2026-05-13 · 10 CVEs total

CVE-2026-33376 7.4 HIGH Auth Proxy IPv6 whitelist bypass
CVE-2026-33377 7.1 HIGH Dashboard Import Overwrites ACL — Editor Privilege Escalation to Dashboard Admin
CVE-2026-28379 6.5 MEDIUM Viewer-triggered race condition in Grafana Live leads to complete server crash
CVE-2026-28380 6.5 MEDIUM BAC in Snapshot API allows deletion of unauthorized dashboard snapshots
CVE-2026-28383 6.5 MEDIUM Grafana plugin resources can lead to unbounded memory allocation
CVE-2026-28376 6.5 MEDIUM Grafana Live push endpoint allows unbounded memory allocation leading to OOM
CVE-2026-33380 6.3 MEDIUM SQL Expressions Read File From Disk
CVE-2026-33381 5.9 MEDIUM Users can generate Service Account tokens after permissions removal
CVE-2026-28374 4.3 MEDIUM IDOR in Annotations API allows unprivileged users to DELETE annotation

IV. Related Vulnerabilities

Same product: Grafana OSS
Same vendor: Grafana

V. Comments for CVE-2026-33378

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