Red Hat Security Advisory

RHSA-2026:36167

Assisted Installer RHEL 9 components for Multicluster Engine for Kubernetes 2.6.12

Released 2026-07-07 · Red Hat rating Important · View on Red Hat →

Fixed in

multicluster engine for Kubernetes 2.6 registry.redhat.io/multicluster-engine/assisted-service-9-rhel9

Fixes 3 records

TI-2026-28703 CVE-2026-39821 · GHSA-w2q5-6q6x-x959

Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna

MEDIUM 47

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label.

CVSS 3.1CRITICAL 9.6 Network Low privileges No interaction EPSS 0.01834 Published 2026-05-22 Partial fix · 1.25.13, 1.26.6 +2 CWE-1289

TI-2026-38567 CVE-2026-53488 · GHSA-xhf5-7wjv-pqxp

Improper input validation in backstage containerd

MEDIUM 42

containerd is an open-source container runtime.

CVSS 4.0CRITICAL 9.4 Local No auth No interaction EPSS 0.00176 Published 2026-07-01 Partial fix · 1.7.33, 2.0.10 +3 CWE-20

TI-2026-28710 CVE-2026-39828 · GHSA-45gg-vh54-h5m9

Invoking bypass of certificate restrictions in golang.org/x/crypto/ssh

LOW 28

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a sec…

CVSS 3.1MEDIUM 6.3 Network Low privileges No interaction EPSS 0.00369 Published 2026-05-22 Partial fix · 0.52.0 CWE-295