RHSA-2025:3052 - Security Advisory

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:
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

• Gatekeeper 3.18 x86_64

Fixes

• BZ - 2348367 - CVE-2025-22869 golang.org/x/crypto/ssh: Denial of Service in the Key Exchange of golang.org/x/crypto/ssh
• HYPBLD-604 - New Deliverable Request for Gatekeeper 3.18.0
• ACM-15684 - Upgrade Gatekeeper to 3.18
• ACM-15900 - Gatekeeper autoFromCache=Automatic error when namespaceSeletor is used in match

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