Red Hat Security Advisory: Multicluster Global Hub 1.5.6 security update

CVE-2026-25681 — golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting CVE-2026-27136 — golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass CVE-2026-33376 — grafana: Grafana Auth Proxy: Unauthorized access due to incorrect IPv6 allow-list default CVE-2026-33377 — grafana: Grafana: Privilege escalation via dashboard overwrite CVE-2026-33811 — net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME CVE-2026-39821 — golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing CVE-2026-41567 — docker: Moby/Docker Engine: Arbitrary Code Execution via malicious container image and compressed archive upload CVE-2026-42151 — github.com/prometheus/prometheus: Prometheus: Information disclosure of Azure OAuth client secret via config API CVE-2026-42154 — github.com/prometheus/prometheus: Prometheus: Denial of Service via uncontrolled memory allocation in remote read endpoint CVE-2026-43870 — apache-thrift: Apache Thrift: Denial of Service via multiple vulnerabilities CVE-2026-46384 — github.com/hamba/avro/v2: github.com/linkedin/goavro/v2: Integer Overflow in Avro Decoder CVE-2026-46385 — github.com/hamba/avro/v2: github.com/linkedin/goavro/v2: CPU Exhaustion in Avro Decoder via Unbounded Block-Count Iteration CVE-2026-53488 — github.com/containerd/containerd: containerd: Host-root command execution via unvalidated image config labels in CRI plugin CVE-2026-53492 — github.com/containerd/containerd: containerd: Security bypass via Container Device Interface (CDI) annotation smuggling during checkpoint restoration.