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CVE-2026-54523— Kyverno: NamespacedGeneratingPolicy generator.apply() namespace argument unvalidated -- background controller creates RoleBindings in any namespace including kube-system

Quick assessment

Affected
kyverno kyverno
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kyverno 是为云原生平台工程团队设计的策略引擎。在 1.18.0 到 1.18.2 版本中，NamespacedMutatingPolicy 的 CEL 编译器将 generator 库暴露给 matchConditions，使得命名空间级别的策略可以调用 并指定任意的目标命名空间。 中的验证逻辑只检查策略能否编译，但并未强制限定命名空间作用域；而 中的 函数也没有拒绝跨命名空间的目标。因此，能够在某个命名空间中创建 NamespacedMutatingPolicy 对象的普通用户，可以促使具有集群级权限的准

CVSS 9.6 · Critical

Possible ATT&CK Techniques 1 AI

T1548 · Abuse Elevation Control Mechanism

Affected Version Matrix 1

VendorProduct Version RangeStatus
kyverno kyverno >= 1.18.0, < 1.18.2 affected
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I. Basic Information for CVE-2026-54523

Vulnerability Information
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Vulnerability Title
Kyverno: NamespacedGeneratingPolicy generator.apply() namespace argument unvalidated -- background controller creates RoleBindings in any namespace including kube-system
Source: CVE Program / CVE List V5
Vulnerability Description
Kyverno is a policy engine designed for cloud native platform engineering teams. From 1.18.0 until 1.18.2, the NamespacedMutatingPolicy CEL compiler exposes the generator library to matchConditions, allowing a namespace-scoped policy to invoke generator.apply(namespace, resources) with an arbitrary target namespace. The validation in pkg/cel/policies/mpol/validate.go checks that the policy compiles but does not enforce namespace scope, and GenerateResources in pkg/cel/libs/context.go does not reject the cross-namespace target. A user who can create NamespacedMutatingPolicy objects in one namespace can cause the admission controller, operating with cluster-wide privileges, to create ConfigMaps, NetworkPolicies, Secrets, RoleBindings, and other resources in another namespace, enabling unauthorized modification and potential privilege escalation. This issue is fixed in version 1.18.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kyverno kyverno >= 1.18.0, < 1.18.2 -

II. Public POCs for CVE-2026-54523

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6855 chars
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III. Intelligence Information for CVE-2026-54523

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Patches & Fixes for CVE-2026-54523 (3)

Vendor Advisories for CVE-2026-54523 (1)

Vendor Pages for CVE-2026-54523 (1)

IV. Related Vulnerabilities

Same product: kyverno
Same vendor: kyverno
Same weakness: CWE-862

V. Comments for CVE-2026-54523

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