CVE-2026-8609: medium-severity vulnerability in Grafana OSS
Pre-authentication denial of service via the OAuth login route
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.3epss 0.4%
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).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
Grafana · Grafana OSSRelated CVEs — Grafana OSS
In the same product, most dangerous first.
CVE-2026-15815HIGHCVE-2026-15815 CVE RecordEPSS 0.7%CVE-2026-33375MEDIUMGrafana MSSQL Data Source Plugin: Restriction Bypass Leading to OOM DoSEPSS 0.5%CVE-2026-42129HIGHPath traversal in the Loki data source pluginEPSS 0.4%CVE-2026-42127HIGHPre-authentication denial of service in the public dashboard query endpointEPSS 0.4%CVE-2026-19475MEDIUMSQL Data Source Plugin: OOM DoS via $__timeGroup macroEPSS 0.4%CVE-2026-33382HIGHDenial of service via unbounded request body sizeEPSS 0.4%