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CVE-2026-28375 Grafana CVE debrief

CVE-2026-28375 is a medium-severity vulnerability in Grafana's testdata data-source that can trigger out-of-memory crashes. The vulnerability was published on March 27, 2026, and last modified on June 17, 2026. It has a CVSS score of 6.5 and is classified as CWE-400. The vulnerability affects multiple versions of Grafana, including those prior to 8.1.0, 11.6.14, 12.0.0, 12.1.10, 12.2.8, and 12.3.6. Users of affected versions should take immediate action to mitigate the risk.

Vendor
Grafana
Product
Unknown
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-03-27
Original CVE updated
2026-06-17
Advisory published
2026-03-27
Advisory updated
2026-06-17

Who should care

Grafana users and administrators who rely on the testdata data-source should be aware of this vulnerability and take steps to mitigate it. This includes upgrading to a patched version of Grafana or applying recommended mitigations.

Technical summary

The vulnerability is caused by a flaw in the testdata data-source of Grafana, which can be exploited to trigger out-of-memory crashes. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating a medium-severity vulnerability with a high impact on availability. Affected versions of Grafana include those prior to 8.1.0, 11.6.14, 12.0.0, 12.1.10, 12.2.8, and 12.3.6.

Defensive priority

medium

Recommended defensive actions

  • Upgrade to a patched version of Grafana (8.1.0 or later, 11.6.14 or later, 12.0.0 or later, 12.1.10 or later, 12.2.8 or later, or 12.3.6 or later)
  • Apply recommended mitigations as described in the vendor advisory [ref-4]
  • Monitor Grafana logs for signs of out-of-memory crashes
  • Implement memory limits and monitoring for Grafana instances
  • Restrict access to the testdata data-source to only trusted users
  • Regularly review and update Grafana configurations to ensure security best practices are followed
  • Consider implementing additional security measures such as rate limiting and IP blocking

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and the CVE.org record. The vulnerability was published on March 27, 2026, and last modified on June 17, 2026. The CVSS score and vector were provided by the NVD.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-28375 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-28375

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-28375 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-28375

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.