Threats affecting pkg:golang/google.golang.org/grpc

This security update for warewulf4 addresses two critical vulnerabilities in the google.golang.org/grpc library. The first vulnerability (CVE-2026-84445) allows denial of service (DoS) via a crash caused by missing ':authority' and 'Host' headers in gRPC-Go xDS servers. The second vulnerability (CVE-2026-84303) involves an xDS RBAC HTTP filter implementation issue that permits bypassing authorization policies through mixed-case or canonical-case header matches.

Multiple security vulnerabilities in grpc-go affect the xDS RBAC authorization engine and HTTP/2 transport server. These include an authorization bypass due to unsupported RBAC policy matchers being ignored, a denial of service via high CPU consumption from HTTP/2 rapid reset mitigation bypass, and a server panic caused by parsing crafted RBAC policies with unsupported fields inside NOT rules. These issues can lead to unauthorized access, service crashes, or resource exhaustion. All vulnerabilities are fixed in grpc-go version 1.82.1.

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.18.38. See the following advisory for the container images for this release: https://access.redhat.com/errata/RHSA-2026:8448 Security Fix(es): * google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. All OpenShift Container Platform 4.18 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.