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CVE-2026-27879 Grafana CVE debrief

CVE-2026-27879 is a medium-severity vulnerability affecting Grafana, a popular open-source analytics and visualization platform. The vulnerability allows an attacker to trigger an out-of-memory crash by sending a specially crafted resample query. This can be done by an attacker with low privileges, making it a concern for organizations using Grafana. The vulnerability has a CVSS score of 6.5 and is tracked under CWE-787 and CWE-400. Grafana has released an advisory with mitigation steps.

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

Organizations using Grafana, especially those with self-hosted instances, should be aware of this vulnerability. Grafana administrators and security teams should assess their exposure and take necessary actions to mitigate the risk.

Technical summary

The vulnerability exists in the resample query functionality of Grafana. An attacker with low privileges (PR:L) can send a malicious query that causes the system to run out of memory, leading to a crash. The vulnerability is characterized by the following CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. Affected versions include Grafana up to 8.0.0, 11.6.14 to 12.0.0, 12.1.10 to 12.2.0, 12.2.8 to 12.3.0, and 12.3.6 to 12.4.0.

Defensive priority

Medium

Recommended defensive actions

  • Update Grafana to a version that is not vulnerable.
  • Implement network access controls to limit who can send queries to Grafana.
  • Monitor Grafana logs for suspicious query activity.
  • Consider implementing a Web Application Firewall (WAF) to detect and block malicious queries.
  • Restrict query capabilities for low-privilege users.
  • Regularly review and update Grafana configurations to ensure security best practices are followed.

Evidence notes

The information provided is based on data from the National Vulnerability Database (NVD) and the CVE.org record. The CVE was published on 2026-03-27 and modified on 2026-06-17. The vulnerability details are sourced from official vulnerability databases and vendor advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-27879 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-27879

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

  • CVE-2026-27879 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-27879

    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.