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

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.

Published: 2026-05-13 Last update: 2026-05-28 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-33378 is rated Low Risk (30.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-33378

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-14 — 0.04% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-33378

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2026-33378

GitHub Security Advisory for CVE-2026-33378

GHSA-rr8q-qwrv-9pf6 · Severity: medium — Using the $__timeGroup macro, one can achieve an OOM by overloading the server. This requires a...

OS Trackers for CVE-2026-33378

vendor priority summary link
suse medium — https://www.suse.com/security/cve/CVE-2026-33378/
ubuntu medium CVE-2026-33378 medium priority: Ubuntu including 1 source packages (grafana), 5 status rows across 5 suites (jammy, noble, questing, resolute, upstream): DNE 4, needs-triage 1. https://ubuntu.com/security/CVE-2026-33378

Affected software / configurations for CVE-2026-33378

Vendor Product Version Raw CPE
grafana grafana >= 8.0.0, < 11.6.14 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana >= 12.0.0, < 12.2.8 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana >= 12.3.0, < 12.3.6 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana >= 12.4.0, < 12.4.3 cpe:2.3:a:grafana:grafana:*:*:*:*:*:*:*:*
grafana grafana 11.6.14 cpe:2.3:a:grafana:grafana:11.6.14:-:*:*:*:*:*:*
grafana grafana 11.6.14 cpe:2.3:a:grafana:grafana:11.6.14:security01:*:*:*:*:*:*
grafana grafana 12.2.8 cpe:2.3:a:grafana:grafana:12.2.8:-:*:*:*:*:*:*
grafana grafana 12.2.8 cpe:2.3:a:grafana:grafana:12.2.8:security01:*:*:*:*:*:*
grafana grafana 12.3.6 cpe:2.3:a:grafana:grafana:12.3.6:-:*:*:*:*:*:*
grafana grafana 12.3.6 cpe:2.3:a:grafana:grafana:12.3.6:security01:*:*:*:*:*:*
grafana grafana 12.4.3 cpe:2.3:a:grafana:grafana:12.4.3:-:*:*:*:*:*:*
grafana grafana 13.0.0 cpe:2.3:a:grafana:grafana:13.0.0:*:*:*:*:*:*:*
grafana grafana 13.0.1 cpe:2.3:a:grafana:grafana:13.0.1:-:*:*:*:*:*:*

References for CVE-2026-33378

cvelogic Threat Intelligence