Description
A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Kubernetes | Kubernetes | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | kubernetes | 1.20.5+really1.20.2-1 | — |
| Debian 13 | kubernetes | 1.20.5+really1.20.2-1 | — |
| Debian 12 | kubernetes | 1.20.5+really1.20.2-1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kubernetes1.33 | 1.33.13-2.1 | openSUSE-SU-2026:11388-1 |
| openSUSE Tumbleweed | kubernetes1.34 | 1.34.10-1.1 | openSUSE-SU-2026:11389-1 |
| openSUSE Tumbleweed | kubernetes1.35 | 1.35.7-1.1 | openSUSE-SU-2026:11390-1 |
| openSUSE Tumbleweed | kubernetes1.36 | 1.36.3-1.1 | openSUSE-SU-2026:11391-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kubernetes | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | k8s.io/kubernetes | <= 1.22.2 | — | GHSA-74j8-88mm-7496 |
Advisories 5
- WID-SEC-2026-2596 Kubernetes: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 30, 2026
- openSUSE-SU-2026:11388-1 kubernetes1.33-apiserver-1.33.13-2.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- openSUSE-SU-2026:11389-1 kubernetes1.34-apiserver-1.34.10-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- openSUSE-SU-2026:11390-1 kubernetes1.35-apiserver-1.35.7-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- openSUSE-SU-2026:11391-1 kubernetes1.36-apiserver-1.36.3-1.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026