CVE-2025-1974

CVE-2025-1974 — IngressNightmare ingress-nginx はじめに 本書では、Kubernetes の ingress-nginx コンポーネント（validating admission controller）に影響を及ぼす脆弱性 CVE-2025-1974 に関する調査を紹介します。 CVE-2025-1974 は CVSS 3.1 9.8 の重大な脆弱性であり、ingress-nginx プロセスのコンテキストでの未認証の Remote Code Execution RCE です。攻撃を実行すると、pod ネットワークへのアクセス（または...

CVE-2021-25735

CVE-2021-25735 CVE-2021-25735 を悪用する: Kubernetes Validating Admission Webhook バイパス 脆弱性環境のセットアップ まず、gencerts.sh スクリプトを実行して TLS 証明書と鍵を生成します。 bash gencerts.sh アドミッションコントローラをデプロイするには、以下のコマンドを使用して Docker コンテナイメージをローカルでビルドし、タグを付け、イメージを Dockerhub にプッシュする必要があります。 docker login docker build -t...

externalip-webhook

externalip-webhook CVE-2020-8554를 해결하기 위해 만들어졌습니다. 참고: 이 차트는 쿠버네티스 1.21 버전부터 더 이상 사용되지 않으며, 1.22부터는 지원되지 않습니다. CVE-2020-8554를 완화하려면 클러스터에서 DenyServiceExternalIPs 어드미션 컨트롤러를 활성화하세요. externalip-webhook는 서비스가 임의의 외부 IP를 사용하지 못하도록 방지하는 검증 웹훅입니다. 클러스터 관리자는 allowed-external-ip-cidrs 파라미터를 지정하여 외부 IP로 사...

CVE-2026-55636

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC c...

EUVD-2026-78670

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC c...

CVE-2026-55636

Capsule (a multi-tenancy and policy-based framework for Kubernetes) versions 0.13.0 through 0.13.6 contain a singular/plural typo in charts/capsule/templates/configuration.yaml: the validating webhook rule specifies namespace/finalize instead of namespaces/finalize. Because Kubernetes webhook rul...

CVE-2026-55636 Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC c...

CVE-2026-55636: Incorrect Authorization

Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC c...

GO-2024-2428 vulnerabilities

Vulnerabilities for packages: ingress-nginx-controller...

SUSE CVE-2026-30963

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and...

GHSA-GC3J-79F2-7VVW Fission: Cross-namespace event leakage via KubernetesWatchTrigger allows persistent tenant surveillance

Summary A low-privilege developer who could create a KubernetesWatchTrigger KWT in their own namespace was able to establish a persistent surveillance channel over any other namespace. Details Two independent flaws compounded: 1. pkg/kubewatcher/kubewatcher.go::createKubernetesWatch used...

Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected

Summary Capsule v0.13.2 webhook rules contain namespace/finalize singular instead of namespaces/finalize plural. K8s requires plural. The finalize defense from CVE-2026-30963 fix is absent. Details PUT to /api/v1/namespaces//finalize has resource=namespaces plural. The singular rule never matches...

CVE-2026-30963

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and...

CVE-2026-30963

Capsule (a Kubernetes multi-tenancy framework) relied on a webhook to validate namespace updates, but prior to v0.13.0 it did not intercept namespace/status or namespace/finalize subresource changes. This omission enables a tenant with permission to modify those subresources to hijack other names...

CVE-2026-30963 Capsule Namespace Hijacking via subresource

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and...

CVE-2026-30963 Capsule Namespace Hijacking via subresource

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and...

EUVD-2026-33739

Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and...

GHSA-2WW6-HF35-MFJM Capsule Namespace Hijacking via subresource

Summary To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and namespace/status subresource APIs can also modify various fields of a...

Capsule Namespace Hijacking via subresource

Summary To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and namespace/status subresource APIs can also modify various fields of a...

PT-2026-44722

Name of the Vulnerable Software and Affected Versions Capsule versions prior to 0.13.0 Description Capsule uses a webhook to validate update requests targeting namespaces to prevent namespace hijacking. However, the webhook fails to define interception rules for the 'namespace/finalize' and...