Security readout for executives and security teams
Plain-English summary
An authenticated Grafana user may exhaust server memory by submitting a malicious negative interval through a SQL data-source query macro. A successful attack can make Grafana unavailable. The reported crash may take more than 30 minutes, and automatic restart can substantially reduce disruption.
Executive priority
Prioritize normal-cycle remediation, escalating systems where untrusted or broadly assigned users can query SQL data sources. Immediate emergency action is less compelling because authentication is required, exploitation is slow, and restart controls may limit impact. Availability-critical Grafana deployments deserve faster review.
Technical view
CVE-2026-33378 is a CWE-400 resource-exhaustion flaw in Grafana OSS. The $__timeGroup macro can accept a negative interval that causes out-of-memory exhaustion when used with a SQL data source. CVSS 3.1 is 6.5: network-accessible, low complexity, low privileges, no user interaction, with availability impact only.
Likely exposure
Exposure requires a listed Grafana OSS release, a configured SQL data source, and a low-privileged authenticated user able to submit relevant queries. The source bundle marks versions outside the listed releases as unaffected by default; administrators should confirm exact applicability with Grafana's advisory.
Exploitation context
No active exploitation is established by the provided sources, and the CVE is not listed as KEV in the bundle. Exploitation requires authenticated access and may take over 30 minutes to crash the server. Auto-restart can make the practical impact minimal, although repeated attempts could still affect availability.
Researcher notes
The evidence supports availability loss through memory exhaustion, not confidentiality or integrity compromise. Key exposure variables are exact Grafana version, SQL data-source presence, query permissions, and restart behavior. The bundle does not name a fixed version or document exploitation in the wild, so remediation specifics must come from Grafana's advisory.
Mitigation direction
- Review Grafana's advisory for the applicable fixed release or vendor-recommended mitigation.
- Upgrade affected Grafana OSS deployments according to Grafana's published guidance.
- Restrict query capabilities and SQL data-source access to users who require them.
- Ensure restart and monitoring controls detect and recover from memory exhaustion.
Validation and detection
- Inventory Grafana OSS versions and compare them with the advisory's affected releases.
- Identify deployments with SQL data sources configured.
- Review which authenticated roles can create or submit SQL data-source queries.
- Inspect memory, restart, and availability telemetry for unexplained sustained resource exhaustion.
- Confirm the deployed version or mitigation status against Grafana's advisory.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-33378 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.83.6GRAFANAVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://grafana.com/security/security-advisories/cve-2026-33378CVE reference, GRAFANA · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.