CVE-2025-59823 Gardener providers vulnerable to code injection when Terraformer is used for infrastructure provisioning
Administrative users can inject code via Terraformer to gain control over the seed cluster in Gardener Kubernetes management.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59823?
CVE-2025-59823 is a critical code injection vulnerability in gardener-extension-provider-aws, published on 25 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Project Gardener implements the automated management and operation of Kubernetes clusters as a service. Code injection may be possible in Gardener Extensions for AWS providers prior to version 1.64.0, Azure providers prior to version 1.55.0, OpenStack providers prior to version 1.49.0, and GCP providers prior to version 1.46.0. This vulnerability could allow a user with administrative privileges for a Gardener project to obtain control over the seed cluster where the shoot cluster is managed. This affects all Gardener installations where Terraformer is used/can be enabled for infrastructure provisioning with any of the affected components. This issue has been patched in Gardener Extensions for AWS providers version 1.64.0, Azure providers version 1.55.0, OpenStack providers version 1.49.0, and GCP providers version 1.46.0.
Weakness: CWE-94
Which versions are affected by CVE-2025-59823?
12 open source packages ship an affected version, including github.com/gardener/gardener-extension-provider-aws, github.com/gardener/gardener-extension-provider-azure and github.com/gardener/gardener-extension-provider-gcp.
| Package | Affected | Fixed in |
|---|---|---|
github.com/gardener/gardener-extension-provider-aws Go | All versions | 1.64.0 |
github.com/gardener/gardener-extension-provider-aws Go | All versions | 1.64.0 |
github.com/gardener/gardener-extension-provider-aws Go | All versions | 1.64.0 |
github.com/gardener/gardener-extension-provider-azure Go | All versions | 1.55.0 |
github.com/gardener/gardener-extension-provider-azure Go | All versions | 1.55.0 |
github.com/gardener/gardener-extension-provider-azure Go | All versions | 1.55.0 |
6 more packages
github.com/gardener/gardener-extension-provider-gcp Go | All versions | 1.46.0 |
github.com/gardener/gardener-extension-provider-gcp Go | All versions | 1.46.0 |
github.com/gardener/gardener-extension-provider-gcp Go | All versions | 1.46.0 |
github.com/gardener/gardener-extension-provider-openstack Go | All versions | 1.49.0 |
github.com/gardener/gardener-extension-provider-openstack Go | All versions | 1.49.0 |
github.com/gardener/gardener-extension-provider-openstack Go | All versions | 1.49.0 |
How do I fix CVE-2025-59823?
Upgrade github.com/gardener/gardener-extension-provider-aws to 1.64.0 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-59823 being exploited?
There is no known exploitation of CVE-2025-59823 in the wild and no public exploit code.
Sources
Also known as GHSA-227x-7mh8-3cf6, GO-2025-3981.