Issued:

2025-03-20

Updated:

2025-03-20

RHSA-2025:3052 - Important: Gatekeeper v3.18.0

Synopsis

Important: Gatekeeper v3.18.0

Type/Severity

Security Advisory Important

Topic

Gatekeeper v3.18.0

Description

Gatekeeper v3.18.0

Gatekeeper is a validating webhook with auditing capabilities that can enforce custom resource definition-based policies that are run with the Open Policy Agent (OPA). Gatekeeper is supported through a Red Hat Advanced Cluster Management for Kubernetes subscription.

Starting in v3.17, users can specify a containerArguments list of names and values for both the audit and webhook configurations to be passed to the respective deployment. These will be ignored if the argument has already been set by the operator or specifies an argument listed in the deny list.

Starting in v3.15, the following namespaces are exempt from admission control:

• kube-*
• multicluster-engine
• hypershift
• hive
• rhacs-operator
• open-cluster-*
• openshift-*

To disable the default exempt namespaces, set the namespaces you want on the object.

Security fix(es):

• golang.org/x/crypto/ssh: Denial of Service in the Key Exchange of golang.org/x/crypto/ssh (CVE-2025-22869)

Additional Release Notes:

• v3.18.0 https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.18.0
• v3.18.1 https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.18.1
• v3.18.2 https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.18.2

Solution

For more information, see the following resources:

• See the Gatekeeper documentation: https://open-policy-agent.github.io/gatekeeper/website/docs/.

• For support and troubleshooting, Gatekeeper is supported through a Red Hat Advanced Cluster Management for Kubernetes subscription: This content is not included.https://access.redhat.com/products/red-hat-advanced-cluster-management-for-kubernetes.

• The Open Policy Agent Gatekeeper community collaborates on Slack. Join the #opa-gatekeeper channel: https://openpolicyagent.slack.com/archives/CDTN970AX.

• Open issues on the Gatekeeper GitHub repository: https://github.com/open-policy-agent/gatekeeper/issues.

• See the installation and upgrade documentation: https://open-policy-agent.github.io/gatekeeper/website/docs/install.

Affected Products

Fixes

• This content is not included.BZ - 2348367
• This content is not included.HYPBLD-604
• This content is not included.ACM-15684
• This content is not included.ACM-15900

CVEs

• CVE-2019-12900
• CVE-2020-11023
• CVE-2021-43618
• CVE-2022-48554
• CVE-2023-7104
• CVE-2023-29491
• CVE-2023-37920
• CVE-2024-2236
• CVE-2024-3596
• CVE-2024-12797
• CVE-2024-28834
• CVE-2024-28835
• CVE-2024-34397
• CVE-2024-56171
• CVE-2025-22869
• CVE-2025-24928

References

• https://access.redhat.com/security/updates/classification/#important
• Content from github.com is not included.Content from github.com is not included.https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.18.0
• Content from github.com is not included.Content from github.com is not included.https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.18.1
• Content from github.com is not included.Content from github.com is not included.https://github.com/open-policy-agent/gatekeeper/releases/tag/v3.18.2

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.