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Red Hat Security Advisory: Multicluster Global Hub 1.4.8 security updateCVE-2026-33376 0 A critical security vulnerability (CVE-2026-33376) affects Red Hat's Multicluster Global Hub component, specifically related to Grafana's Auth Proxy IPv6 allow-list. The flaw causes the default IPv6 allow-list mask to be overly broad (/32 instead of the intended /128), potentially allowing unauthorized remote access and data manipulation. This issue impacts only Auth Proxy deployments using IPv6 allow-lists; other authentication methods are not affected. The vulnerability has been rated critical by Red Hat Product Security. Mitigation involves explicitly specifying the correct IPv6 mask in the Grafana Auth Proxy configuration and restarting the service. No direct fix or patch version is specified in the advisory, so users must apply the configuration change to mitigate the risk. Join the discussion | GCVE Database | 08/17/2026, 16:44:44 UTC Added: 08/19/2026, 13:50:56 UTC |
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