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PatchSiren cyber security CVE debrief

CVE-2026-8609 Grafana CVE debrief

An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service). This issue was reported by [email protected]. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity. System administrators should assess the vulnerability and apply patches or mitigations as necessary.

Vendor
Grafana
Product
Grafana OSS
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-10
Original CVE updated
2026-07-13
Advisory published
2026-07-10
Advisory updated
2026-07-13

Who should care

System administrators and security teams responsible for Grafana instances should assess the vulnerability and apply patches or mitigations as necessary. They should also review and adjust Grafana instance configurations, monitor performance, and verify the effectiveness of compensating controls.

Technical summary

CVE-2026-8609 is a denial-of-service vulnerability in Grafana's OAuth login route. An unauthenticated attacker can cause unbounded memory growth by repeatedly calling the login route with unique values, potentially leading to a crash. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity. This issue affects Grafana instances and requires patches or mitigations to prevent potential denial-of-service attacks.

Defensive priority

Apply patches or mitigations for Grafana instances to prevent potential denial-of-service attacks. Review and adjust Grafana instance configurations, monitor performance, and verify compensating controls.

Recommended defensive actions

  • Apply patches or updates from Grafana
  • Review and adjust Grafana instance configurations
  • Monitor Grafana instance performance
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-10T16:16:39.510Z and last modified on 2026-07-10T18:01:31.563Z. The NVD entry is currently Awaiting Analysis. This information is based on the CVE record and NVD entry. Further verification is recommended.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8609 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8609

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

  • CVE-2026-8609 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8609

    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.