A flaw was found in Red Hat Quay's Proxy Cache configuration feature. When an organization administrator configures an upstream registry for proxy caching, Quay makes a network connection to the specified registry hostname without verifying that it points to a legitimate external service. An attacker with organization administrator privileges could supply a crafted hostname to force the Quay server to make requests to internal network services, cloud infrastructure endpoints, or other resources that should not be accessible from the Quay application.
https://access.redhat.com/errata/RHSA-2026:48085
https://access.redhat.com/errata/RHSA-2026:43052
https://access.redhat.com/errata/RHSA-2026:42796
https://access.redhat.com/errata/RHSA-2026:42146
https://access.redhat.com/errata/RHSA-2026:41066
https://access.redhat.com/errata/RHSA-2026:41031