CVE-2026-33376: high-severity vulnerability in Grafana OSS
Auth Proxy IPv6 whitelist bypass
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.4epss 0.3%
When using an IPv6 allow-list for the Auth Proxy feature, it defaults to /32 addresses. Addresses specifying a mask explicitly are not affected; to mitigate easily, add the desired mask (usually /128) to the addresses. Only auth proxy is affected; Okta, SAML, LDAP, etc are unaffected here.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
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-2026-8609MEDIUMPre-authentication denial of service via the OAuth login routeEPSS 0.4%