CVE-2026-54523

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.

CVSS 3.1 breakdown

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

• https://github.com/kyverno/kyverno/commit/0919553c0ea1904f8d891280c92018da97946a06
• https://github.com/kyverno/kyverno/commit/5164bcdeda5b57678bc2d7a03ecc2cbb02982dae
• https://github.com/kyverno/kyverno/pull/16238
• https://github.com/kyverno/kyverno/releases/tag/v1.18.2
• https://github.com/kyverno/kyverno/security/advisories/GHSA-79gf-7frw-68m9
• https://github.com/kyverno/sdk/commit/6573937441443e1ba5af9fbb28d5c0f20297f9df

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

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