Security Advisories and CVEs

Rancher is committed to informing the community of security issues in our products. Rancher will publish security advisories and CVEs (Common Vulnerabilities and Exposures) for issues we have resolved. New security advisories are also published in Rancher’s GitHub security page.

ID Description Date Resolution

ID	Description	Date	Resolution
CVE-2024-58259	POSTs to the Rancher API endpoints are now limited to 1 Mi; this is configurable through the settings if you need a larger limit. The Rancher authentication endpoints are configured independently of the main public API (as you might need bigger payloads in the other API endpoints). Suppose you need to increase the maximum allowed payload for authentication. In that case, you can set the environment variable `CATTLE_AUTH_API_BODY_LIMIT` to a quantity, e.g., 2 Mi, which would allow larger payloads for the authentication endpoints.	28 Aug 2025	Rancher v2.12.1, v2.11.5, v2.10.9 and v2.9.11
CVE-2024-52284	Following a recent change excluding Helm values files from bundles, an edge case subsisted where the values files referenced in `fleet.yaml` with your directory name (e.g., `my-dir/values.yaml` instead of `values.yaml`) would not be excluded, which would potentially expose confidential data in bundle resources. Helm values files are now excluded from bundle resources regardless of how you reference them.	28 Aug 2025	Rancher v2.12.1, v2.11.5 and v2.10.9
CVE-2025-23390	This vulnerability only affects customers using Continuous Delivery with Fleet where Fleet does not validate a server’s certificate when connecting through SSH. This can allow for a main-in-the-middle-attack against Fleet. The fix provides a new `insecureSkipHostKeyChecks` value for the `fleet` Helm chart. The default value is set to `true` (opt-in) for Rancher v2.9 - v2.11 for backward compatibility. The default value is set to `false` (opt-out) for Rancher v2.12 and later, and Fleet v0.13 and later. `true` (opt-in): If `insecureSkipHostKeyChecks` is set to `true`, then not finding any matching `known_hosts` entry for an SSH host will not lead to any error. Please note, regardless of the configuration setting, if the `known-hosts` ConfigMap is deleted it will lead to errors as it will be considered a symptom of an incomplete Fleet deployment. `false` (opt-out): If `insecureSkipHostKeyChecks` is set to `false`, then strict host key checks are enabled. When enabled, the checks ensure that when using SSH, Fleet rejects connection attempts to hosts not matching any entry found in (decreasing order of precedence): A secret referenced by name in a `GitRepo` which is located in the same `GitRepo’s` namespace. If no such secret name is provided, in a `gitcredential` secret located in the same namespace. A new `known-hosts` ConfigMap, created during the Fleet chart installation time and located in the namespace `cattle-fleet-system`. This happens regardless of whether a `GitRepo` uses an SSH URL to point to a Git repository since, once cloned, a repository may be found to contain external resources to be retrieved, such as Helm artifacts. A limitation with the default `known_hosts` entries is that they are only provided for GitHub, Gitlab, Bitbucket and Azure DevOps hosts. If you need to connect to a different host, or if key fingerprints for the provided entries are updated, the following options are available: Manually update the default `known-hosts` ConfigMap. Reference a secret from your `GitRepo` resources, containing the updated or additional `known_hosts` entries. Create a `gitcredential` secret containing the entries for `GitRepo` resources that do not already reference a secret.	24 Apr 2025	Rancher v2.11.1, v2.10.5, and v2.9.9
CVE-2024-22031	A vulnerability was found where users could create a project and then gain access to arbitrary projects. As a fix, a new field has been added to projects called the `BackingNampespace`, which represents the namespace created for a project containing all resources needed for project operations. This includes resources such as ProjectRoleTemplateBindings, project-scoped secrets and workloads. The field is populated automatically during project creation and is formatted as `<clusterID>-<project.Name>`. For example, if your project is named `project-abc123` in a cluster with ID `cluster-xyz789`, then the project will have the `BackingNampespace`: `cluster-xyz789-project-abc123`. Existing projects will not be migrated and only newly created projects will have the new namespace naming convention.	24 Apr 2025	Rancher v2.11.1, v2.10.5, and v2.9.9
CVE-2023-32198	A vulnerability was found where users with permission to create a service in the Kubernetes cluster where Rancher is deployed can take over the Rancher UI, display their own UI, and gather sensitive information. This is only possible when the setting `ui-offline-preferred` is set to `remote`. This release introduces a patch, and the malicious user can no longer serve their own UI. If users can’t upgrade, please make sure that only trustable users have access to create a service in the local cluster.	24 Apr 2025	Rancher v2.11.1, v2.10.5, v2.9.9, and v2.8.15
CVE-2025-23391	A vulnerability has been identified within Rancher where a Restricted Administrator can change the password of Administrators and take over their accounts. A Restricted Administrator should not be allowed to change the password of more privileged users unless it contains the Manage Users permissions. A new validation has been added to block a user from editing or deleting another user with more permissions than themselves. Rancher deployments where the Restricted Administrator role is not being used are not affected by this CVE.	31 Mar 2025	Rancher v2.11.0, v2.10.4, v2.9.8 and v2.8.14

CVE-2024-58259

POSTs to the Rancher API endpoints are now limited to 1 Mi; this is configurable through the settings if you need a larger limit. The Rancher authentication endpoints are configured independently of the main public API (as you might need bigger payloads in the other API endpoints). Suppose you need to increase the maximum allowed payload for authentication. In that case, you can set the environment variable CATTLE_AUTH_API_BODY_LIMIT to a quantity, e.g., 2 Mi, which would allow larger payloads for the authentication endpoints.

28 Aug 2025

Rancher v2.12.1, v2.11.5, v2.10.9 and v2.9.11

CVE-2024-52284

Following a recent change excluding Helm values files from bundles, an edge case subsisted where the values files referenced in fleet.yaml with your directory name (e.g., my-dir/values.yaml instead of values.yaml) would not be excluded, which would potentially expose confidential data in bundle resources. Helm values files are now excluded from bundle resources regardless of how you reference them.

28 Aug 2025

Rancher v2.12.1, v2.11.5 and v2.10.9

CVE-2025-23390

This vulnerability only affects customers using Continuous Delivery with Fleet where Fleet does not validate a server’s certificate when connecting through SSH. This can allow for a main-in-the-middle-attack against Fleet. The fix provides a new insecureSkipHostKeyChecks value for the fleet Helm chart. The default value is set to true (opt-in) for Rancher v2.9 - v2.11 for backward compatibility. The default value is set to false (opt-out) for Rancher v2.12 and later, and Fleet v0.13 and later.

true (opt-in):

If insecureSkipHostKeyChecks is set to true, then not finding any matching known_hosts entry for an SSH host will not lead to any error. Please note, regardless of the configuration setting, if the known-hosts ConfigMap is deleted it will lead to errors as it will be considered a symptom of an incomplete Fleet deployment.

false (opt-out):

If insecureSkipHostKeyChecks is set to false, then strict host key checks are enabled. When enabled, the checks ensure that when using SSH, Fleet rejects connection attempts to hosts not matching any entry found in (decreasing order of precedence):

A secret referenced by name in a GitRepo which is located in the same GitRepo’s namespace.
If no such secret name is provided, in a gitcredential secret located in the same namespace.
A new known-hosts ConfigMap, created during the Fleet chart installation time and located in the namespace cattle-fleet-system.

This happens regardless of whether a GitRepo uses an SSH URL to point to a Git repository since, once cloned, a repository may be found to contain external resources to be retrieved, such as Helm artifacts.

A limitation with the default known_hosts entries is that they are only provided for GitHub, Gitlab, Bitbucket and Azure DevOps hosts. If you need to connect to a different host, or if key fingerprints for the provided entries are updated, the following options are available:

Manually update the default known-hosts ConfigMap.
Reference a secret from your GitRepo resources, containing the updated or additional known_hosts entries.
Create a gitcredential secret containing the entries for GitRepo resources that do not already reference a secret.

24 Apr 2025

Rancher v2.11.1, v2.10.5, and v2.9.9

CVE-2024-22031

A vulnerability was found where users could create a project and then gain access to arbitrary projects. As a fix, a new field has been added to projects called the BackingNampespace, which represents the namespace created for a project containing all resources needed for project operations. This includes resources such as ProjectRoleTemplateBindings, project-scoped secrets and workloads.

The field is populated automatically during project creation and is formatted as <clusterID>-<project.Name>. For example, if your project is named project-abc123 in a cluster with ID cluster-xyz789, then the project will have the BackingNampespace: cluster-xyz789-project-abc123. Existing projects will not be migrated and only newly created projects will have the new namespace naming convention.

24 Apr 2025

Rancher v2.11.1, v2.10.5, and v2.9.9

CVE-2023-32198

A vulnerability was found where users with permission to create a service in the Kubernetes cluster where Rancher is deployed can take over the Rancher UI, display their own UI, and gather sensitive information. This is only possible when the setting ui-offline-preferred is set to remote. This release introduces a patch, and the malicious user can no longer serve their own UI. If users can’t upgrade, please make sure that only trustable users have access to create a service in the local cluster.

24 Apr 2025

Rancher v2.11.1, v2.10.5, v2.9.9, and v2.8.15

CVE-2025-23391

A vulnerability has been identified within Rancher where a Restricted Administrator can change the password of Administrators and take over their accounts. A Restricted Administrator should not be allowed to change the password of more privileged users unless it contains the Manage Users permissions. A new validation has been added to block a user from editing or deleting another user with more permissions than themselves. Rancher deployments where the Restricted Administrator role is not being used are not affected by this CVE.

31 Mar 2025

Rancher v2.11.0, v2.10.4, v2.9.8 and v2.8.14