Red Hat Security Advisory

RHSA-2026:81008

OpenShift Virtualization v4.21 Images

Released 2026-10-12 · Red Hat rating Important · View on Red Hat →

Fixed in

Red Hat Container Native Virtualization 4.21 registry.redhat.io/container-native-virtualization/kubemacpool-rhel9

TI-2026-26189 CVE-2026-33818 · GHSA-xc2p-8ggw-6cr5

MEDIUM 40

Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures.

CVSS 3.1HIGH 7.5 Network No auth No interaction EPSS 0.00568 Published 2026-08-13 Partial fix · 1.25.13, 1.26.6 +1 CWE-400