What’s Vulnerable › Vulnerabilities

CVE-2026-18874: Volsync-addon-controller: volsync-addon-controller: annotation values rendered into yaml via text/template without escaping allows yaml injection into subscription

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-10-26
• Weakness: CWE-94

Description

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 Advanced Cluster Management for Kubernetes 2.11: all versions — fixed in 1787683560
• Red Hat Advanced Cluster Management for Kubernetes 2.13: all versions — fixed in 1787266564
• Red Hat Advanced Cluster Management for Kubernetes 2.14: all versions — fixed in 1787266564
• Red Hat Advanced Cluster Management for Kubernetes 2.15: all versions — fixed in 1787266360
• Red Hat Advanced Cluster Management for Kubernetes 2.16: all versions — fixed in 1787266564
• Red Hat Advanced Cluster Management for Kubernetes 2.17: all versions — fixed in 1787266556

How to fix

Upgrade to a fixed version: Red Hat Advanced Cluster Management for Kubernetes 2.11 1787683560; Red Hat Advanced Cluster Management for Kubernetes 2.13 1787266564; Red Hat Advanced Cluster Management for Kubernetes 2.14 1787266564; Red Hat Advanced Cluster Management for Kubernetes 2.15 1787266360; Red Hat Advanced Cluster Management for Kubernetes 2.16 1787266564; Red Hat Advanced Cluster Management for Kubernetes 2.17 1787266556. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:60386
• https://access.redhat.com/errata/RHSA-2026:60387
• https://access.redhat.com/errata/RHSA-2026:60388
• https://access.redhat.com/errata/RHSA-2026:60389
• https://access.redhat.com/errata/RHSA-2026:60390
• https://access.redhat.com/errata/RHSA-2026:60391
• https://access.redhat.com/security/cve/CVE-2026-18874
• https://bugzilla.redhat.com/show_bug.cgi?id=2511115

Get alerted when CVE-2026-18874 or the next vulnerability affects your stack