CVE-2026-18874: Red Hat Advanced Cluster Management For Kubernetes 2.11

Medium severity, CVSS 6.2. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was found in volsync-addon-controller. This vulnerability allows an attacker to inject malicious YAML (Yet Another Markup Language) code into the OpenShift Lifecycle Manager (OLM) Subscription resource. This is due to improper escaping of annotation values when they are rendered into YAML. Successful exploitation could lead to unauthorized modification or control over OLM Subscription configurations, potentially impacting software management within the cluster. This issue primarily affects systems where the 'volsync-addon-deploy-type: olm' annotation is explicitly enabled.

Affected products

• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.11: before 1787683560 (fixed in 1787683560)
• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.13: before 1787266564 (fixed in 1787266564)
• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.14: before 1787266564 (fixed in 1787266564)
• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.15: before 1787266360 (fixed in 1787266360)
• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.16: before 1787266564 (fixed in 1787266564)
• Red Hat Red Hat Advanced Cluster Management For Kubernetes 2.17: before 1787266556 (fixed in 1787266556)

Published 2026-08-19. Last modified 2026-09-08.