CVE-2026-18874 Code injection in Red Hat Advanced Cluster Management for Kubernetes 2.11
Attackers can inject malicious YAML into OLM Subscriptions via unescaped annotations, potentially compromising cluster software management.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18874?
CVE-2026-18874 is a medium-severity code injection vulnerability in Red Hat Advanced Cluster Management for Kubernetes 2.11, published on 19 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-94
Which versions are affected by CVE-2026-18874?
How do I fix CVE-2026-18874?
No fix has been published for CVE-2026-18874 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-18874 being exploited?
There is no known exploitation of CVE-2026-18874 in the wild and no public exploit code.
Sources
Also known as GHSA-9w6h-ch94-8j27.