Gardener provider extensions vulnerable to code injection when Terraform is used for infrastructure provisioning

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.9 · CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2025-59823: 0.49% estimated exploitation activity in the next 30 days; percentile 42.43 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact A security vulnerability was discovered in Gardener when Terraformer is used for infrastructure provisioning. 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 CVE affects all Gardener installations where Terraformer is used/can be enabled for infrastructure provisioning with any of the affected components mentioned below. Affected Components • gardener-extension-provider-gcp • gardener-extension-provider-azure • gardener-extension-provider-openstack • gardener-extension-provider-aws Affected Versions • gardener-extension-provider-gcp < v1.46.0 • gardener-extension-provider-azure < v1.55.0 • gardener-extension-provider-openstack < v1.49.0 • gardener-extension-provider-aws < v1.64.0 Fixed versions • gardener-extension-provider-gcp = v1.46.0 • gardener-extension-provider-azure = v1.55.0 • gardener-extension-provider-openstack = v1.49.0 •…

Published by the source

25 Sep 2025, 16:39 UTC

Last modified by the source

23 Oct 2025, 20:12 UTC

Source last checked

26 Oct 2026, 15:13 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-227x-7mh8-3cf6

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# Patch Next advisory brief: CVE-2025-59823

Advisory: Gardener provider extensions vulnerable to code injection when Terraform is used for infrastructure provisioning
IDs: CVE-2025-59823, GHSA-227x-7mh8-3cf6
Record: https://patchnext.com/advisories/cve-2025-59823 (revision 1, source checked 26 Oct 2026, 15:13 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/gardener/gardener-extension-provider-azure 1.55.0; github.com/gardener/gardener-extension-provider-aws 1.64.0; github.com/gardener/gardener-extension-provider-openstack 1.49.0; github.com/gardener/gardener-extension-provider-gcp 1.46.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/gardener/gardener-extension-provider-azure: affected < 1.55.0; fixed in 1.55.0
- Go github.com/gardener/gardener-extension-provider-aws: affected < 1.64.0; fixed in 1.64.0
- Go github.com/gardener/gardener-extension-provider-openstack: affected < 1.49.0; fixed in 1.49.0
- Go github.com/gardener/gardener-extension-provider-gcp: affected < 1.46.0; fixed in 1.46.0

## Suggested inspection (read-only)
- Go github.com/gardener/gardener-extension-provider-azure: check the installed version with your package manager.
- Go github.com/gardener/gardener-extension-provider-aws: check the installed version with your package manager.
- Go github.com/gardener/gardener-extension-provider-openstack: check the installed version with your package manager.
- Go github.com/gardener/gardener-extension-provider-gcp: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/gardener/gardener-extension-provider-azure, github.com/gardener/gardener-extension-provider-aws, github.com/gardener/gardener-extension-provider-openstack, github.com/gardener/gardener-extension-provider-gcp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-227x-7mh8-3cf6 (GitHub-reviewed advisory GHSA-227x-7mh8-3cf6 lists affected ranges: Go github.com/gardener/gardener-extension-provider-aws >=0 =0 =0 =0 <1.49.0)

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